have you ever fallen asleep and not realized it??

Q: for example you feel like you just blink and its the next day already :O has this ever happened to you?? and can anyone explain why it happens... like last night i turned off my tv and was going to listen to my ipod and it was in my hand so i sat up to untangle it and when i looked at my clock it was around 4:30 am and i had to get up to go to school already. i guess i fell asleep immediately after i turned off my tv :S

A: This one time I swear, I fell asleep when I was walking, and when I woke up, I was right by my house. TRIPPY!

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