Comment by nick3443
After investigating my own sleep patterns and from what I've learned taking, not taking, and then occasionally targetedly taking melatonin. I think the night waking/night creativity could be a late peak of melatonin above some threshold level which causes agitation, heightened feelings, etc. as described in the article.
I've definitely experienced this too. If I time melatonin wrong and don't get to rest right after taking it, I get more anxious and almost feel the same as late into a sleepness night.