Sleeping in the dark can reduce your risk of heart disease and diabetes, a study suggests.
Exposure to overhead lighting during sleep at night, compared to sleeping in a dimly lit room, harms heart function during sleep and affects how well the body responds to insulin the next morning, researchers found.
They say it is important for people to avoid or minimise the amount of light exposure during sleep, and that if people are able to see things well, it is probably too light.
The study found that, when exposed to more light during sleep, the body went into a state of alert, with the heart rate rising and the body not able to rest properly.
The scientists people should not turn lights on but if they do need to have some light – for example, in the interests of safety for older adults – it should be dim and closer to the floor.
The colour is also important, with amber or a red-orange light less stimulating for the brain.
Blackout curtains or eye masks are a good option if outdoor light cannot be controlled.
“The results from this study demonstrate that just a single night of exposure to moderate room lighting during sleep can impair glucose and cardiovascular regulation, which are risk factors for heart disease, diabetes and metabolic syndrome,” said senior study author Dr Phyllis Zee, chief of sleep medicine at Northwestern University Feinberg School of Medicine in America.
Dr Daniela Grimaldi, a co-lead author and research assistant professor of neurology at Northwestern, said: “We showed your heart rate increases when you sleep in a moderately lit room.
“Even though you are asleep, your autonomic nervous system is activated. That’s bad.
“Usually, your heart rate together with other cardiovascular parameters are lower at night and higher during the day.”
The study of 20 people found that insulin resistance occurred the morning after people slept in a light room.
This is when cells in muscles, fat and the liver do not respond well to insulin and cannot use glucose from the blood for energy.
To make up for it, the pancreas makes more insulin and, over time, blood sugar goes up.
The people in the study were not aware of the biological changes in their bodies at night.
“But the brain senses it,” Dr Grimaldi said. “It acts like the brain of somebody whose sleep is light and fragmented. The sleep physiology is not resting the way it’s supposed to.”
Researchers tested the effect of sleeping with moderate overhead lighting compared to dim lighting over a single night.
The study shows that moderate light exposure caused the body to go into a higher alert state.
In this state, the heart rate increases, as well as the force with which the heart contracts and the rate of how fast the blood is conducted to your blood vessels for oxygenated flow.
“These findings are important, particularly for those living in modern societies where exposure to indoor and outdoor night-time light is increasingly widespread,” Dr Zee said.
The findings are published in Proceedings of the National Academy of Sciences.
Labour dispute
The insured employee may still file an ILOE claim even if a labour dispute is ongoing post termination, but the insurer may suspend or reject payment, until the courts resolve the dispute, especially if the reason for termination is contested. The outcome of the labour court proceedings can directly affect eligibility.
- Abdullah Ishnaneh, Partner, BSA Law
Score
New Zealand 266 for 9 in 50 overs
Pakistan 219 all out in 47.2 overs
New Zealand win by 47 runs
New Zealand lead three-match ODI series 1-0
Next match: Zayed Cricket Stadium, Abu Dhabi, Friday
What can victims do?
Always use only regulated platforms
Stop all transactions and communication on suspicion
Save all evidence (screenshots, chat logs, transaction IDs)
Report to local authorities
Warn others to prevent further harm
Courtesy: Crystal Intelligence
Key facilities
- Olympic-size swimming pool with a split bulkhead for multi-use configurations, including water polo and 50m/25m training lanes
- Premier League-standard football pitch
- 400m Olympic running track
- NBA-spec basketball court with auditorium
- 600-seat auditorium
- Spaces for historical and cultural exploration
- An elevated football field that doubles as a helipad
- Specialist robotics and science laboratories
- AR and VR-enabled learning centres
- Disruption Lab and Research Centre for developing entrepreneurial skills
The specs
Engine: 2.0-litre 4-cylinder turbo
Power: 240hp at 5,500rpm
Torque: 390Nm at 3,000rpm
Transmission: eight-speed auto
Price: from Dh122,745
On sale: now
The specs
AT4 Ultimate, as tested
Engine: 6.2-litre V8
Power: 420hp
Torque: 623Nm
Transmission: 10-speed automatic
Price: From Dh330,800 (Elevation: Dh236,400; AT4: Dh286,800; Denali: Dh345,800)
On sale: Now
if you go
The flights Fly Dubai, Air Arabia, Emirates, Etihad, and Royal Jordanian all offer direct, three-and-a-half-hour flights from the UAE to the Jordanian capital Amman. Alternatively, from June Fly Dubai will offer a new direct service from Dubai to Aqaba in the south of the country. See the airlines’ respective sites for varying prices or search on reliable price-comparison site Skyscanner.
The trip
Jamie Lafferty was a guest of the Jordan Tourist Board. For more information on adventure tourism in Jordan see Visit Jordan. A number of new and established tour companies offer the chance to go caving, rock-climbing, canyoning, and mountaineering in Jordan. Prices vary depending on how many activities you want to do and how many days you plan to stay in the country. Among the leaders are Terhaal, who offer a two-day canyoning trip from Dh845 per person. If you really want to push your limits, contact the Stronger Team. For a more trek-focused trip, KE Adventure offers an eight-day trip from Dh5,300 per person.
Killing of Qassem Suleimani
The specs
- Engine: 3.9-litre twin-turbo V8
- Power: 640hp
- Torque: 760nm
- On sale: 2026
- Price: Not announced yet
F1 The Movie
Starring: Brad Pitt, Damson Idris, Kerry Condon, Javier Bardem
Director: Joseph Kosinski
Rating: 4/5
Sole survivors
- Cecelia Crocker was on board Northwest Airlines Flight 255 in 1987 when it crashed in Detroit, killing 154 people, including her parents and brother. The plane had hit a light pole on take off
- George Lamson Jr, from Minnesota, was on a Galaxy Airlines flight that crashed in Reno in 1985, killing 68 people. His entire seat was launched out of the plane
- Bahia Bakari, then 12, survived when a Yemenia Airways flight crashed near the Comoros in 2009, killing 152. She was found clinging to wreckage after floating in the ocean for 13 hours.
- Jim Polehinke was the co-pilot and sole survivor of a 2006 Comair flight that crashed in Lexington, Kentucky, killing 49.
The specs: 2018 Mercedes-Benz E 300 Cabriolet
Price, base / as tested: Dh275,250 / Dh328,465
Engine: 2.0-litre four-cylinder
Power: 245hp @ 5,500rpm
Torque: 370Nm @ 1,300rpm
Transmission: Nine-speed automatic
Fuel consumption, combined: 7.0L / 100km
Green ambitions
- Trees: 1,500 to be planted, replacing 300 felled ones, with veteran oaks protected
- Lake: Brown's centrepiece to be cleaned of silt that makes it as shallow as 2.5cm
- Biodiversity: Bat cave to be added and habitats designed for kingfishers and little grebes
- Flood risk: Longer grass, deeper lake, restored ponds and absorbent paths all meant to siphon off water
The specs
Engine: 4.0-litre flat-six
Torque: 450Nm at 6,100rpm
Transmission: 7-speed PDK auto or 6-speed manual
Fuel economy, combined: 13.8L/100km
On sale: Available to order now
Ferrari 12Cilindri specs
Engine: naturally aspirated 6.5-liter V12
Power: 819hp
Torque: 678Nm at 7,250rpm
Price: From Dh1,700,000
Available: Now
UAE v IRELAND
All matches start at 10am, and will be played in Abu Dhabi
1st ODI, Friday, January 8
2nd ODI, Sunday, January 10
3rd ODI, Tuesday, January 12
4th ODI, Thursday, January 14
The Sand Castle
Director: Matty Brown
Stars: Nadine Labaki, Ziad Bakri, Zain Al Rafeea, Riman Al Rafeea
Rating: 2.5/5
