Try to hack your body into feeling more relaxed so your scholarly zeal calms down a bit and lets your mind rest.
I'll tell you what works for me.
Good luck! :)
EDIT: Oh, also what about psychoactive stuff like coffee and alcohol? Coffee in the afternoons can cause tossing and turning at night even though the wakefulness benefits are long gone. Alcohol is considered a CNS depressant but it can still lead to some difficulty sleeping because of other related effects.
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