sleep in versus oversleep
to sleep in means to purposefully sleep longer than normal.
examples
I always sleep in on Sunday.
Marsha had nothing to do on Saturday, so she slept in.
Greg works hard but loves sleeping in when he can.
to oversleep means to sleep later than you intended, and probably means that you probably missed something.
Bob overslept and was late for work.
Oversleeping caused Jim to lose his job.
James set the alarm, but was so tired that he overslept.


