Topics: Ask an American: Sleep-deprived teenagers; to buy versus to purchase versus to acquire; to burn the candle at both ends; Let's versus shall we? versus why don't we?

Words:
out of it
period
to stay awake
sleep-deprived
cranky
depression
astonishing
health center
admission
fatigue
tardiness
alert
to buy
to purchase
to acquire
to burn the candle at both ends
let's
Shall we?
Why don't we?