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.
你怎样才能意识到自己睡眠不足？当电话商店的售货员兴高采烈地通知你，你黑莓手机(BlackBerry)的电池已经坏掉的时候，你就意识到了——因为每晚仅充电4小时是不足以让电池保持健康的。
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