My daughter took Melatonin for years to help her have restful sleep. She can't deep sleep for she needs to be able to hear if her patients need her. Some of them have insomnia, so she never gets to bed before midnight.
Lately, she's on the Atkins diet again and that effects her, too. She takes a pot gummie (1/4) and that does the trick.
Me? If I lay down, I go to sleep. At times if I've slept during the day a lot, it might take a few minutes, but I'm soon making z's!