- 6 hours before bed: no more caffeine intake. Some people may need to go as high as 12
- 3 hours before bed: no more food. No more drinks with sugar/substitutes.
- 2 hours before bed: no more drinks (not everyone needs this; I have to pee a lot and getting out of bed just before falling asleep or waking up midway sucks)
- 1.5 hours before bed: shower followed by hot bath. Especially if you’re somewhere like Japan where insulation is a joke and everything is drafty and cold currently
- 1 hour before bed: no more active content (games, study, etc.) and preferably no serious content. Watch/read something only for pleasure, meditate, etc. ideally, avoid blue light and bright light in general.
- bedtime: no screens nor lights. Cooler, comfortable temperatures are good. Have comfortable sheets, bedclothes (if you wear them), potentially blackout curtains, etc. and keep them clean
Also, if at all possible, wake up and go to bed at the same time every day including weekends.
This works for me when in the system. The only bad part is if I’m on call or on holiday, my schedule easily gets smashed and takes a long time to get back (some people are luckier and can adjust instantly). Edit: Also, try to make sure you ARE getting light during the waking hours, preferably natural light; this helps with your body’s natural rhythms.
Edit2: also, try to move. Being fully sedentary is hard mode. Also lol at the downvote. At least say why. I realize not everyone is able to do all those, if that’s what your after, but this has all helped me.
I think it’s more like a political Ouija board where people are influencing the plectrum to get it where they think it should be.