Is Your Sleep Cycle Out of Sync? It May Be Genetic

我以為是缺乏紀律（？）和自控能力才會越來越晚睡，原來可以怪罪遺傳？（真好。）

Taking melatonin might help, but only if it’s timed correctly. Naturally, melatonin levels begin to rise about two hours before sleep, so it may help night owls fall asleep earlier if it is taken orally two hours before their desired bedtime.