You enter your English class. Your teacher hands you your test and you begin working on it. After about 20 minutes, you finish your test and hand it to the teacher and walk back over to your desk. You glance up at the clock, you still have about 30 minutes left of class. You decide to catch a little bit of sleep, resting your arms on the desk and placing your head on them, closing your eyes as you drift off to sleep.

You wake up, but your classroom is empty. Where did everyone go?