Actually, I’ve read you should never exercise three hours before bedtime. You can take calcium, magnesium, and potassium. These are known sleep aids and help with restless leg syndrome, if you happen to have that. My wife has RLS (which is why I am awake at a quarter to 3am!). Some swear by chamomile tea. I personally hate tea.
Milk and honey are good. Even better is milk and brandy.
Also, I know this sounds strange, eating warm or room temperature potatoes, pasta, or a piece of candy before bed can help you sleep. Or so I’ve read. Of course, some say never eat right before turning in.
Good luck.