Difference in time zone, jet lag, lack of morning coffee - are frequently cited reasons as to why you're especially grouchy.
时区的不同、时差、或者没有早茶，这些都是经常会引起你特别不高兴的原因。
Many people already use Provigil to cope with night-shift work, jet lag and lack of sleep, and suffer few side-effects.
很多人会在上夜班、长途飞行以及缺少睡眠时服用Provigil，只会有轻微的副作用。
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