A team at the Institute of Cancer Research found women have a greater risk of gaining weight if their bedroom was light enough to see across at night.
They say an increase in exposure to artificial light at night corresponded with an increase in obesity over the past century.The study looked at data from more than 100,000 women and found their body mass index, waist-hip ratio, waist-height ratio and waist circumference all increase when they were exposed to more light at night
researchers caution there isn't enough evidence yet to prove that sleeping in complete dark will help you lose weight.
But shooting for a darker room might help you achieve better sleep
overall, and that's healthy.
by delaying melatonin production - the hormone that helps us sleep. So being surrounded by your TV, computer and phone screens late at night might make it harder to fall asleep.