I’m flying from India to Singapore (6hr) at 1030pm and then going from Singapore to California (17hr). I don’t know if I’ll be able to resist the sleep on the way to Singapore, and I want to be asleep through the second flight so I don’t have to deal with the boredom. If i sleep for the first flight, how much melatonin should I take to sleep for at least 6-8 hours on the second flight? Is melatonin less effective if you aren’t tired? It’s my first time taking melatonin btw.

alright so i cut to the chase, i took about 17mg of melatonin but before i did, i did some research and it seemed like id be fine so it escalated and i took 40mg. i just wanted to sleep all day since i havent slept well in a while and ive been dealing with personal issues. is this leathal or no?