Factors outside of our control—jobs and families and light pollution, to name a few—can make this hard to do. But when possible, here are a few simple ideas that many experts recommend. Try to keep a somewhat constant bedtime and wake-up time, even on weekends. Keep caffeine use moderate, even if you don’t feel like a nighttime coffee affects you. The same goes for nightcaps. (Not necessarily a joyless suggestion—maybe you can meet a friend for a beer at 4 p.m. instead of 10 p.m.) Use screens judiciously, too. Remember that even on night mode, a phone is shooting light into your brain. Have sex with someone instead. Or, sometimes preferable, read something on paper.