Answers:
The potassium surrounded by them will prevent leg cramps while you sleep.
It to some extent depends on what you do with them. If, for instance, you stick one up each nostril you will probably find sleep harder than usual.
I'm going to go with thwart.
They are an energy snack...
I realise that eating can grounds sleepiness as the stomach directs blood away from muscles to digest, but the sugars in the banana will kick start them again afterwards.
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