Stretch before you go to bed, and loosen up a bit. Read a book or a magazine or whatever for a while, maybe listen to the radio, and then turn in for the night. All of that helps me most nights. Otherwise try some of those relaxation videos on YouTube.
Reading will 100% knock you out. I tend to pass out 5min into a book if I am on my bed. Sitting up I am fine though.
Try it, read something. Perhaps make it super boring.....