sleep-in
adjective
• (of a domestic employee) resident in an employer's house.
• "a sleep-in babysitter"
sleep-in
noun
• an instance of remaining asleep or in bed longer than usual in the morning.
• "a well-deserved sleep-in"
• a form of protest in which the participants sleep overnight in premises which they have occupied.
• "a student sleep-in began last night"
sleep in
• remain asleep or in bed later than usual in the morning.
• "life assumes a different rhythm on the weekend; we sleep in, cut the grass, wash the car"
• sleep by night at one's place of work.
• "he recalled the days when maids had to sleep in and were on call twenty-four hours a day"