On the night of this experience I ate some dark chocolate prior to dinner. Because I am still not sleepy at 10pm, I decided to take 0.5 mg of Melatonin to help me fall asleep. I think around 30 minutes I suddenly felt very fuzzy, and fell asleep soon after that.
I woke up around 3AM in the morning, and detected some unusual sensations immediately. I felt very relaxed, and comfortable. I could feel warm waves of gentle euphoria wash over me. I was cuddly as well, wanting to hug someone close to me. All this time I was sporting a semi-hard erection, but desire for sex was not very strong, just a desire for
a good hug.
These strong feelings subsided by around 5AM. I woke up a bit later than usual because of this episode, but was not too groggy. Needless to say, the whole experience was pleasant.