Oh Insomnia ! I have a life long relationship with that nasty 8 letter word ! Right now Im actually sleeping nightly more than I ever have, not sure why .
I typically would go days with no sleep, worst was 8 days of no sleep at all. That required a 3 day stop on the psych ward.
Do you have a sleep med ? If so maybe take it once in a while to get a decent amount of sleep ?.. I know there is some OTC stuff you can try or herbal teas.
I wish you luck