I often nap on the bus or subway. Sometimes, I'm lucky and I wake up just before my stop. Other times, unfortunately, I miss it. The worst was one night I slept until the last stop. I heard someone saying "Hey, student, sleep at your home!" I thought the man's voice was coming from outside the bus so I ignored it. The man said it louder and I opened my eyes with surprise and found out that it was the bus driver's voice waking me up. =.=