I heard the US military swears by a bodyscan meditation exercise. That works for me, or at the very least calms me way down. Sometimes I’ll try and take a short walk through the night, because I love it, but thinking about leaving the bed an getting ready for outside makes me very sleepy :) . Good luck falling asleep, unwanted awakeness is super boring and gets old really quick.
Burnout symptoms? Chemical dependence not being satisfied? Hormones?