When you snooze, you take a quick nap during the day. Nobody snoozes for too long though, because then you’d just call it "sleeping."
Maybe you’ve fallen asleep in class before, dozed off while watching a movie, or snoozed for a minute while learning some new vocabulary. Wake up, sleepyhead! Snoozing is a light type of sleep, probably without dreams even. If you like reading at the beach, make sure you’re wearing sunscreen in case you snooze off.