my sims won't sleep

Me too.  they sleep alone. I don't use mods.  He sleeps for a few seconds my time and pops out of bed.  I reset both the sim and the bed.  bought a new bed.  nothing worked.  Seems like I figured out how to fix it before but I don't write it down.  So frustrating.  As bad as when you send them to pee or eat and they ignore that and go on to the next task.