Burn the midnight oil, 6 letters
Choose not to retire, 6 letters
Decline to recline?, 6 letters
Ignore one's bedtime, 6 letters
Put off retirement?, 6 letters
Watch the late show, e.g., 6 letters
Watch the late, late show, perhaps, 6 letters
What kids like to do at a slumber party, 6 letters
Choose not to retire, perhaps, 10 letters
Put off retirement?, 10 letters
What you can do on summer vacation nights: 3 wds., 10 letters