When I moved out, it took ambien and time to get my sleep back to normal, I've now been off ambien for 9 months.
Ex's thing late at night was to blare his music to "help him sleep", didn't care about the rest of the household.
I figured out finally that he used disrupting the family's sleep as a form of torture, he figured he was unhappy, he'd make the rest of us unhappy. and it worked.