Get up at the same time every day, including weekendsWake time anchors the whole circadian system far more strongly than bedtime does. If you fix one thing, fix this one.
Get light in your eyes within an hour of wakingOutdoor light, even on an overcast day, is many times brighter than indoor lighting and is the strongest signal your body clock receives.
If you are awake for more than twenty minutes, get out of bedThis is stimulus control, a core component of CBT for insomnia. Lying awake teaches your brain that bed is a place for being awake.
Keep the bedroom coolCore body temperature has to drop for sleep to begin. A warm room works against that. Around eighteen degrees suits most people.
Move your last coffee two hours earlierEasier to sustain than quitting, and often enough. Caffeine half life is five to six hours.
Do not check the clock at nightIt converts wakefulness into arithmetic about how ruined tomorrow will be. Turn it away from you.
Alcohol makes you fall asleep faster and sleep worseIt suppresses REM early in the night and fragments the second half. The sedation is real and so is the cost.
Naps before three in the afternoon, under thirty minutesLonger or later and you are borrowing from tonight.