Related Clues:
- Drop off for a while
- Sleep, it being twelve (but not noon)
- Loser's mistake?
- One's agitated about small amount of sleep
- Get some sack time
- Be less than vigilant
- Catch a few winks
- Grab some shut-eye
- Drop off most of the 12?
- Get some quick rest
- Not pay attention during a lecture, say
- Drop off tin with leak
- Catch a catnap
- Take a short nap
- Not get up just yet