Gwern’s melatonin piece is probably your best first port of call on this (and many other) subjects. I’ve been taking it pretty regularly (most nights) for coming up to a year, and can still fall asleep without too much difficulty without it. “Without too much difficulty” is a bit of a relative term, though. I keep somewhat unusual hours and have had difficulty getting to sleep for as long as I can remember.
Gwern’s melatonin piece is probably your best first port of call on this (and many other) subjects. I’ve been taking it pretty regularly (most nights) for coming up to a year, and can still fall asleep without too much difficulty without it. “Without too much difficulty” is a bit of a relative term, though. I keep somewhat unusual hours and have had difficulty getting to sleep for as long as I can remember.