How come you never know when you are about to fall asleep? ?!

Question: How come you never know when you are about to fall asleep.? .?

i mean really there is no warning or feeling it is just POP your asleep

why.?
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Answers:

that guy inside your head just pulls the switch and boom your asleep just dont piss him off or he will wake you upHealth Question & Answer

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How come you never know when you are about to fall asleep? ?!

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