[1] : WordNet (r) 2.0

sleep in
     v 1: sleep later than usual or customary; "on sundays, i sleep
          in" syn: sleep late
     2: live in the house where one works; "our babysitter lives in,
        as it is too far to commute for her" syn: live in
        ant: live out
see also:
sleep late live in live out 

Sleep >> S Words
Sleep, definition of term: Sleep
sleep_pag1.html

Sleep Off >> S Words
Sleep Off, definition of term: Sleep Off
sleep+off_pag1.html

Sleep In >> S Words
Sleep In, definition of term: Sleep In
sleep+in_pag1.html

Beauty Sleep >> B Words
Beauty Sleep, definition of term: Beauty Sleep
beauty+sleep_pag1.html

Cat Sleep >> C Words
Cat Sleep, definition of term: Cat Sleep
cat+sleep_pag1.html