Exposure to dim light during sleeping hours can increase actual weight by … 50% (!) comparatively to those sleeping in obscurity – without consuming more calories! The study, conducted on mice, reasoned that eating patterns were disrupted, making the animals eat at times when they normally wouldn’t. This resulted in weight gain. Also alarming was the increased incidence of impaired glucose tolerance measured.
It is thought that the melatonin levels are somehow disrupted when sleeping with even dim lighting.
So, weight gain can result from, not only excess caloric consumption and lack of exercise, but also from late-night television watching, computer work or gaming, and nightlights.
Turning off nightlights and reading instead of watching TV at night might become popular weight management tools!
Article resume: Proceedings of the National Academy of Sciences…