What induces you to sleep?

Some people just drop on the bed with eyes closed, that easy to sleep for them. But most of us mortals don't have an easy time falling to sleep. We need something to lull us to sleep. For me, it is always the crossword puzzle of the dailies that maybe makes my eyes cross, huh. But if there is not crossword, I have to read a book, any book will do. That is my way of making my eyes tired so it will shut off.