So recently I asked this question about Alice, the tips of whose hairs (body and head hairs) could (in that question, not this question) paralyze or poison people.
I thought: what if her hairs only made people sleep? They would contain melatonin or something in large quantities which would trick the human body into thinking it needed to sleep.
Then I started to question whether or not this would be possible. Could Alice send people to sleep - as in, the restorative slumber, complete with potential dreams - or would she be forced to knock them out with a weak toxin to stun them in a way which at all resembles sleep?
Update: Most people seem to be saying no to melatonin. But is there absolutely no way that someone could be put forcefully to sleep and still have a restful slumber?