FWIW, this happens to me on most nights. I find that once I put my book down and turn off the light, there’s a moment that I’m not quite asleep, but not quite awake. My dreams from the previous night–sometimes many nights before–come back with alarming vividness. Often they come accompanied with a deja vu-like feeling; an "oh yeah, I remember that now!" realization, like snapshots of memories that only exist in this dream-like state, never when I’m lucid.
I’ve come to rely on this as a way to relax me even further into a good night’s sleep.
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