Problems staying asleep?

Ok, so I know a lot of people have posted on here about how to get to sleep, but how can I stay asleep or fall back asleep after waking up? I find my problem is that I can fall asleep easily but that I wake up after 4 hours and then can’t get back to sleep for a few hours or just end up staying awake. Any advice on how to stay asleep? I already have a prescription for Ambien and some Ativan for panic attacks that I take occasionally. I don’t really want to rely on chemical means, so any advice would be appreciated.