It's inappropriate to fall asleep when you're still at work.
Gabe has been working at his computer in the office for hours.
Gabe wants to take a nap.
Gabe waits until his lunch break and takes a nap in his car.
Gabe puts his head on his desk and falls asleep during work hours.
Gabe feels energized and refreshed when he comes back after his lunch break.
Gabe is sent home when his boss sees that his isn't being productive.