The hardest time is probably getting to sleep at night. Once my son is in bed, I avoid it myself by solving puzzles and watching YouTube videos.
I’m a lifelong insomniac. For me the trick is to distract my active brain from internal thoughts while simultaneously letting go of the distraction, if that makes any sense 
I often listen to Greg Wagland, of Magpie Audio on Youtube, read Sherlock Holmes. His measured voice puts me to sleep in no time. Of course there is the risk of getting engrossed in the story, so the key is to have the volume low enough so you can just barely make out what he is saying … and drift away.
When I wake during the night, I restart a little ways into the dialogue (just takes a few seconds in my situation)
They are numbered, over 45 total I think, I have them Bookmarked, load a couple in my Tabs each night, listen to them in order, then start over with #1. Each is under an hour or so.
#1 https://www.youtube.com/watch?v=9D0bGia4QrI
#2 https://www.youtube.com/watch?v=9D0bGia4QrI
Here is Magpie Audio’s Home - https://www.youtube.com/c/SherlockHolmesStoriesMagpieAudio/v…
Works for me, maybe useless for you for getting to sleep, but the stories are great.
Good luck.