Not literally wake up from sleep, but you just kind of lose your memories of what was going on before. You got up, went to work, worked hard, and now you're coming back home on a bus. You come to your senses, wondering "were am I?"
The convineintly placed sign at the front of the bus reads:
YOU ARE ON
BUS
BUS
You don't know who you are or where you're going, but you are on bus.
It can get kind of weird, I think, constantly waking up on a bus. Makes you wonder "how much of life is spent in transit?" And even though your mind is blank, you some how remember only the bus rides of past taking you places.
But in the end, you somehow manage through that strange autopilot of humanity, to get off at your appropriate stop.