**A great way to get to sleep is to do something very physical about 4-5 hours before bedtime.**
I prefer 2 or 3 hours before bedtime. Suppertime here is 4:30. I prefer to wait at least 2 to 2 1/2 hours after a big meal before a serious workout. Although I usually get the serious workout (about 3 times a week) done a half hour before supper.
I’m just stating what is known to be best for the body, but not everybody is able to adapt to what is best. Take a hot shower in that case and the cooling down effect will tire you out.