I read about a jet lag cure where you reset your circadian rhythm by fasting for 16 hours and then having a big breakfast at morning time in your target time zone. Now I'm experimenting with doing this sort of intermittent fasting most of the time to normalize my sleep cycle, basically not eating anything after lunch. It feels like I'm having an easier time waking up at the end of the fast, but I'm not sure how strong or stable the effect is.