1. Sleep later than usual or customary
   "On Sundays, I sleep in";
   - sleep late
    
2. Live in the house where one works
   "our babysitter sleeps in, as it is too far to commute for her";
   - live in

Derived forms: slept in, sleeping in, sleeps in

Type of: board, catch some Z's [N. Amer, informal], sleep, slumber