I get it, jlak.
I know it's from my years of drinking. I also have a cyst on my pineal gland that may have something to do it. That gland produces melatonin.
I get 1-2 hours of sleep a night, then maybe none, and usually by the 3rd or 4th day might get 3 hours! Yippee!.
They used to say lack of sleep wouldn't hurt you. Now they say it is a cause of morbidity.
Used to sleep straight through the night years ago.