Even a hint of dim light—8 to 10 lux—has been shown to delay the release of nighttime melatonin in humans. The feeblest of bedside lamps pumps out twice as much: anywhere from 20 to 80 lux. A subtly lit living room, where most people reside in the hours before bed, will hum at around 200 lux. Despite being just 1 to 2 percent of the strength of daylight, this ambient level of incandescent home lighting can have 50 percent of the melatonin-suppressing influence within the brain.
Watch something boring. Just about everything you read about improving sleep advises you to avoid screen time before bed. But the truth is, a lot of people do it anyway. If you’re going to watch TV or your laptop in bed, watch something unexciting. Think a Ken Burns documentary, or an episode of House Hunters. No scary movies, thrillers, or the 11 o’clock news. If it’s likely to get your pulse racing, turn it off. There’s even a website for it — Napflix, which serves up the most snooze-worthy videos on YouTube (think Bonsai tree pruning or tropical fish swimming in an aquarium).