Seven hours of sleep per night is the ideal amount in middle to older age, a UK study has suggested.
Both too much and too little sleep are associated with poorer cognitive performance and mental health, according to researchers from Cambridge University and Fudan University in China.
Scientists examined data from nearly 500,000 adults, aged between 38 and 73, from the UK Biobank.
Participants were asked about their sleeping patterns, mental health and well-being, and took part in a series of cognitive tests.
Brain imaging and genetic data were available for almost 40,000 of the study participants.
The researchers’s analysis of the data indicated that seven hours of sleep per night was the optimal duration for cognitive performance, such as processing speed, visual attention, memory and problem-solving skills.
Prof Barbara Sahakian, Cambridge University’s Department of Psychiatry, said her team's research showed that seven hours of sleep was superior to the typical recommendation of eight hours, particularly for those above 40.
"Seven-hour sleep duration on a regular basis is especially beneficial for the brain, cognition and mental health measures for the age group 44 to 59 years," she told The National.
"This is important because adults of working age benefit most from consistently getting seven hours of sleep"
The findings are in contrast to advice from the UK's National Health Service, which recommends between seven to nine hours of sleep for adults.
But the relationship may be different for younger people and adolescents whose brains are still developing, Prof Sahakian said.
It was also optimal for good mental health, with people experiencing more symptoms of anxiety and depression, and worse overall well-being, if they reported sleeping for longer or shorter hours.
The researchers say one possible reason for the association between insufficient sleep and cognitive decline may be due to the disruption of slow-wave – “deep” – sleep.
Disruption to this type of sleep has been shown to have a close link with memory consolidation as well as the build-up of amyloid – a key protein which, when it misfolds, can cause “tangles” in the brain characteristic of some forms of dementia.
Additionally, lack of sleep may hamper the brain’s ability to rid itself of toxins.
Prof Jianfeng Feng, from Fudan University, said the study pointed to a possible link between sleep and cognitive performance.
“While we can’t say conclusively that too little or too much sleep causes cognitive problems, our analysis looking at individuals over a longer period of time appears to support this idea," he said.
“The reasons why older people have poorer sleep appear to be complex, influenced by a combination of our genetic make-up and the structure of our brains.”
The researchers say the findings suggest that insufficient or excessive sleep duration may be a risk factor for cognitive decline in ageing.
This is supported by previous studies that have reported a link between sleep duration and the risk of developing Alzheimer’s disease and dementia, in which cognitive decline is a hallmark symptom.
“Getting a good night’s sleep is important at all stages of life, but particularly as we age", Prof Sahakian said.
“Finding ways to improve sleep for older people could be crucial to helping them maintain good mental health and well-being, and avoiding cognitive decline, particularly for patients with psychiatric disorders and dementias.”
The research is published in the journal Nature Aging.
England v South Africa schedule
- First Test: Starts Thursday, Lord's, 2pm (UAE)
- Second Test: July 14-18, Trent Bridge, Nottingham, 2pm
- Third Test: The Oval, London, July 27-31, 2pm
- Fourth Test: Old Trafford, Manchester, August 4-8
Timeline
2012-2015
The company offers payments/bribes to win key contracts in the Middle East
May 2017
The UK SFO officially opens investigation into Petrofac’s use of agents, corruption, and potential bribery to secure contracts
September 2021
Petrofac pleads guilty to seven counts of failing to prevent bribery under the UK Bribery Act
October 2021
Court fines Petrofac £77 million for bribery. Former executive receives a two-year suspended sentence
December 2024
Petrofac enters into comprehensive restructuring to strengthen the financial position of the group
May 2025
The High Court of England and Wales approves the company’s restructuring plan
July 2025
The Court of Appeal issues a judgment challenging parts of the restructuring plan
August 2025
Petrofac issues a business update to execute the restructuring and confirms it will appeal the Court of Appeal decision
October 2025
Petrofac loses a major TenneT offshore wind contract worth €13 billion. Holding company files for administration in the UK. Petrofac delisted from the London Stock Exchange
November 2025
180 Petrofac employees laid off in the UAE
The 12
England
Arsenal, Chelsea, Liverpool, Manchester City, Manchester United, Tottenham Hotspur
Italy
AC Milan, Inter Milan, Juventus
Spain
Atletico Madrid, Barcelona, Real Madrid
The language of diplomacy in 1853
Treaty of Peace in Perpetuity Agreed Upon by the Chiefs of the Arabian Coast on Behalf of Themselves, Their Heirs and Successors Under the Mediation of the Resident of the Persian Gulf, 1853
(This treaty gave the region the name “Trucial States”.)
We, whose seals are hereunto affixed, Sheikh Sultan bin Suggar, Chief of Rassool-Kheimah, Sheikh Saeed bin Tahnoon, Chief of Aboo Dhebbee, Sheikh Saeed bin Buyte, Chief of Debay, Sheikh Hamid bin Rashed, Chief of Ejman, Sheikh Abdoola bin Rashed, Chief of Umm-ool-Keiweyn, having experienced for a series of years the benefits and advantages resulting from a maritime truce contracted amongst ourselves under the mediation of the Resident in the Persian Gulf and renewed from time to time up to the present period, and being fully impressed, therefore, with a sense of evil consequence formerly arising, from the prosecution of our feuds at sea, whereby our subjects and dependants were prevented from carrying on the pearl fishery in security, and were exposed to interruption and molestation when passing on their lawful occasions, accordingly, we, as aforesaid have determined, for ourselves, our heirs and successors, to conclude together a lasting and inviolable peace from this time forth in perpetuity.
Taken from Britain and Saudi Arabia, 1925-1939: the Imperial Oasis, by Clive Leatherdale
COMPANY PROFILE
Name: HyperSpace
Started: 2020
Founders: Alexander Heller, Rama Allen and Desi Gonzalez
Based: Dubai, UAE
Sector: Entertainment
Number of staff: 210
Investment raised: $75 million from investors including Galaxy Interactive, Riyadh Season, Sega Ventures and Apis Venture Partners
The specs: 2019 BMW X4
Price, base / as tested: Dh276,675 / Dh346,800
Engine: 3.0-litre turbocharged in-line six-cylinder
Transmission: Eight-speed automatic
Power: 354hp @ 5,500rpm
Torque: 500Nm @ 1,550rpm
Fuel economy, combined: 9.0L / 100km
At a glance
Global events: Much of the UK’s economic woes were blamed on “increased global uncertainty”, which can be interpreted as the economic impact of the Ukraine war and the uncertainty over Donald Trump’s tariffs.
Growth forecasts: Cut for 2025 from 2 per cent to 1 per cent. The OBR watchdog also estimated inflation will average 3.2 per cent this year
Welfare: Universal credit health element cut by 50 per cent and frozen for new claimants, building on cuts to the disability and incapacity bill set out earlier this month
Spending cuts: Overall day-to day-spending across government cut by £6.1bn in 2029-30
Tax evasion: Steps to crack down on tax evasion to raise “£6.5bn per year” for the public purse
Defence: New high-tech weaponry, upgrading HM Naval Base in Portsmouth
Housing: Housebuilding to reach its highest in 40 years, with planning reforms helping generate an extra £3.4bn for public finances
2024%20Dubai%20Marathon%20Results
%3Cp%3E%3Cstrong%3EWomen%E2%80%99s%20race%3A%3C%2Fstrong%3E%0D%3Cbr%3E1.%20Tigist%20Ketema%20(ETH)%202hrs%2016min%207sec%0D%3Cbr%3E2.%20Ruti%20Aga%20(ETH)%202%3A18%3A09%0D%3Cbr%3E3.%20Dera%20Dida%20(ETH)%202%3A19%3A29%0D%3Cbr%3EMen's%20race%3A%0D%3Cbr%3E1.%20Addisu%20Gobena%20(ETH)%202%3A05%3A01%0D%3Cbr%3E2.%20Lemi%20Dumicha%20(ETH)%202%3A05%3A20%0D%3Cbr%3E3.%20DejeneMegersa%20(ETH)%202%3A05%3A42%3C%2Fp%3E%0A
UAE currency: the story behind the money in your pockets
UAE jiu-jitsu squad
Men: Hamad Nawad and Khalid Al Balushi (56kg), Omar Al Fadhli and Saeed Al Mazroui (62kg), Taleb Al Kirbi and Humaid Al Kaabi (69kg), Mohammed Al Qubaisi and Saud Al Hammadi (70kg), Khalfan Belhol and Mohammad Haitham Radhi (85kg), Faisal Al Ketbi and Zayed Al Kaabi (94kg)
Women: Wadima Al Yafei and Mahra Al Hanaei (49kg), Bashayer Al Matrooshi and Hessa Al Shamsi (62kg)
Slow loris biog
From: Lonely Loris is a Sunda slow loris, one of nine species of the animal native to Indonesia, Malaysia, Thailand and Singapore
Status: Critically endangered, and listed as vulnerable on the International Union for Conservation of Nature red list due to growing demand in the global exotic pet trade. It is one of the most popular primate species found at Indonesian pet markets
Likes: Sleeping, which they do for up to 18 hours a day. When they are awake, they like to eat fruit, insects, small birds and reptiles and some types of vegetation
Dislikes: Sunlight. Being a nocturnal animal, the slow loris wakes around sunset and is active throughout the night
Superpowers: His dangerous elbows. The slow loris’s doe eyes may make it look cute, but it is also deadly. The only known venomous primate, it hisses and clasps its paws and can produce a venom from its elbow that can cause anaphylactic shock and even death in humans
Farage on Muslim Brotherhood
Nigel Farage told Reform's annual conference that the party will proscribe the Muslim Brotherhood if he becomes Prime Minister.
"We will stop dangerous organisations with links to terrorism operating in our country," he said. "Quite why we've been so gutless about this – both Labour and Conservative – I don't know.
“All across the Middle East, countries have banned and proscribed the Muslim Brotherhood as a dangerous organisation. We will do the very same.”
It is 10 years since a ground-breaking report into the Muslim Brotherhood by Sir John Jenkins.
Among the former diplomat's findings was an assessment that “the use of extreme violence in the pursuit of the perfect Islamic society” has “never been institutionally disowned” by the movement.
The prime minister at the time, David Cameron, who commissioned the report, said membership or association with the Muslim Brotherhood was a "possible indicator of extremism" but it would not be banned.
The specs: Lamborghini Aventador SVJ
Price, base: Dh1,731,672
Engine: 6.5-litre V12
Gearbox: Seven-speed automatic
Power: 770hp @ 8,500rpm
Torque: 720Nm @ 6,750rpm
Fuel economy: 19.6L / 100km
The%20Little%20Mermaid%20
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Rob%20Marshall%3Cbr%3E%3Cstrong%3EStars%3A%20%3C%2Fstrong%3EHalle%20Bailey%2C%20Jonah%20Hauer-King%2C%20Melissa%20McCarthy%2C%20Javier%20Bardem%3Cbr%3E%3Cstrong%3ERating%3A%20%3C%2Fstrong%3E2%2F5%3Cbr%3E%3Cbr%3E%3C%2Fp%3E%0A
UAE currency: the story behind the money in your pockets
Company Profile
Name: Thndr
Started: 2019
Co-founders: Ahmad Hammouda and Seif Amr
Sector: FinTech
Headquarters: Egypt
UAE base: Hub71, Abu Dhabi
Current number of staff: More than 150
Funds raised: $22 million
SECRET%20INVASION
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Ali%20Selim%20%3Cbr%3E%3Cstrong%3EStars%3A%3C%2Fstrong%3E%20Samuel%20L%20Jackson%2C%20Olivia%20Coleman%2C%20Kingsley%20Ben-Adir%2C%20Emilia%20Clarke%20%3Cbr%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%203%2F5%26nbsp%3B%3C%2Fp%3E%0A
57%20Seconds
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Rusty%20Cundieff%0D%3Cbr%3E%3Cstrong%3EStars%3A%20%3C%2Fstrong%3EJosh%20Hutcherson%2C%20Morgan%20Freeman%2C%20Greg%20Germann%2C%20Lovie%20Simone%0D%3Cbr%3E%3Cstrong%3ERating%3A%20%3C%2Fstrong%3E2%2F5%0D%3Cbr%3E%0D%3Cbr%3E%3C%2Fp%3E%0A
The President's Cake
Director: Hasan Hadi
Starring: Baneen Ahmad Nayyef, Waheed Thabet Khreibat, Sajad Mohamad Qasem
Rating: 4/5
BRIEF SCORES
England 353 and 313-8 dec
(B Stokes 112, A Cook 88; M Morkel 3-70, K Rabada 3-85)
(J Bairstow 63, T Westley 59, J Root 50; K Maharaj 3-50)
South Africa 175 and 252
(T Bavuma 52; T Roland-Jones 5-57, J Anderson 3-25)
(D Elgar 136; M Ali 4-45, T Roland-Jones 3-72)
Result: England won by 239 runs
England lead four-match series 2-1
AndhaDhun
Director: Sriram Raghavan
Producer: Matchbox Pictures, Viacom18
Cast: Ayushmann Khurrana, Tabu, Radhika Apte, Anil Dhawan
Rating: 3.5/5
Water waste
In the UAE’s arid climate, small shrubs, bushes and flower beds usually require about six litres of water per square metre, daily. That increases to 12 litres per square metre a day for small trees, and 300 litres for palm trees.
Horticulturists suggest the best time for watering is before 8am or after 6pm, when water won't be dried up by the sun.
A global report published by the Water Resources Institute in August, ranked the UAE 10th out of 164 nations where water supplies are most stretched.
The Emirates is the world’s third largest per capita water consumer after the US and Canada.
Jetour T1 specs
Engine: 2-litre turbocharged
Power: 254hp
Torque: 390Nm
Price: From Dh126,000
Available: Now
Racecard
6.30pm: Mazrat Al Ruwayah Group Two (PA) US$55,000 (Dirt) 1,600m
7.05pm: Meydan Trophy (TB) $100,000 (Turf) 1,900m
7.40pm: Handicap (TB) $135,000 (D) 1,200m
8.15pm: Balanchine Group Two (TB) $250,000 (T) 1,800m
8.50pm: Handicap (TB) $135,000 (T) 1,000m
9.25pm: Firebreak Stakes Group Three (TB) $200,000 (D) 1,600m
10pm: Handicap (TB) $175,000 (T) 2,410m
The National selections: 6.30pm: RM Lam Tara, 7.05pm: Al Mukhtar Star, 7.40pm: Bochart, 8.15pm: Magic Lily, 8.50pm: Roulston Scar, 9.25pm: Quip, 10pm: Jalmoud
Reading List
Practitioners of mindful eating recommend the following books to get you started:
Savor: Mindful Eating, Mindful Life by Thich Nhat Hanh and Dr Lilian Cheung
How to Eat by Thich Nhat Hanh
The Mindful Diet by Dr Ruth Wolever
Mindful Eating by Dr Jan Bays
How to Raise a Mindful Eaterby Maryann Jacobsen
LOVE%20AGAIN
%3Cp%3EDirector%3A%20Jim%20Strouse%3C%2Fp%3E%0A%3Cp%3EStars%3A%20Priyanka%20Chopra%20Jonas%2C%20Sam%20Heughan%2C%20Celine%20Dion%3C%2Fp%3E%0A%3Cp%3ERating%3A%202%2F5%3C%2Fp%3E%0A
Milestones on the road to union
1970
October 26: Bahrain withdraws from a proposal to create a federation of nine with the seven Trucial States and Qatar.
December: Ahmed Al Suwaidi visits New York to discuss potential UN membership.
1971
March 1: Alex Douglas Hume, Conservative foreign secretary confirms that Britain will leave the Gulf and “strongly supports” the creation of a Union of Arab Emirates.
July 12: Historic meeting at which Sheikh Zayed and Sheikh Rashid make a binding agreement to create what will become the UAE.
July 18: It is announced that the UAE will be formed from six emirates, with a proposed constitution signed. RAK is not yet part of the agreement.
August 6: The fifth anniversary of Sheikh Zayed becoming Ruler of Abu Dhabi, with official celebrations deferred until later in the year.
August 15: Bahrain becomes independent.
September 3: Qatar becomes independent.
November 23-25: Meeting with Sheikh Zayed and Sheikh Rashid and senior British officials to fix December 2 as date of creation of the UAE.
November 29: At 5.30pm Iranian forces seize the Greater and Lesser Tunbs by force.
November 30: Despite a power sharing agreement, Tehran takes full control of Abu Musa.
November 31: UK officials visit all six participating Emirates to formally end the Trucial States treaties
December 2: 11am, Dubai. New Supreme Council formally elects Sheikh Zayed as President. Treaty of Friendship signed with the UK. 11.30am. Flag raising ceremony at Union House and Al Manhal Palace in Abu Dhabi witnessed by Sheikh Khalifa, then Crown Prince of Abu Dhabi.
December 6: Arab League formally admits the UAE. The first British Ambassador presents his credentials to Sheikh Zayed.
December 9: UAE joins the United Nations.
