How do you know you are not sleeping enough? When the clerk at the phone shop gleefully informs you that your Blackberry's battery died because a mere four hours of recharging every night is not enough to keep it healthy.
你怎樣才能意識到自己睡眠不足？當電話商店的售貨員興高采烈地通知你，你黑莓手機(BlackBerry)的電池已經壞掉的時候，你就意識到了——因爲每晚僅充電4小時是不足以讓電池保持健康的。
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