I had trouble getting to sleep when I was younger and I was facing a test or something in the morning. Besides the usual no caffeine/moderate exercise/moderate

I had trouble getting to sleep when I was younger and I was facing a test or something in the morning. Besides the usual no caffeine/moderate exercise/moderate eating etc good advice I came up with a "mind hack" inspired by Richard Feynman. Summarizing: try to re-play or think about dreams that you had before. If you don't remember any, think of a story that looks like a dream (with impossible things happening etc). The trick is that when we transition between awake and asleep we have a train of thought and suddenly there are dream-like things like surprising jumps in the thoughts, impossible occurrences etc (this is what Feynman remarked and I observed too), so I try to recreate that state. It worked for me.