You should never sleep with a light on: TRUE
“We sleep better in the dark because light suppresses melatonin – the sleep-inducing hormone that regulates circadian rhythm,” says Dr Lindsay Browning, sleep expert at Trouble Sleeping and author of Navigating Sleeplessness. “Even with our eyes closed we sense light through our eyelids, so a dark room is preferable.” Consistency is also important, however, according to sleep coach James Wilson, AKA the Sleep Geek: “People who slept with a light on as children, or who grew up in a noisy house, may need a nightlight or white noise from the TV to feel emotionally secure enough for sleep.”
