Many people already use Provigil to cope with night-shift work, jet lag and lack of sleep, and suffer few side-effects.(很多人會在上夜班、長途飛行以及缺少睡眠時服用Provigil，只會有輕微的副作用。)

It's probably because of jet lag.(可能是時差的原因。)

Difference in time zone, jet lag, lack of morning coffee - are frequently cited reasons as to why you're especially grouchy.(時區的不同、時差、或者沒有早茶，這些都是經常會引起你特別不高興的原因。)

I get jet lag for a week after traveling overseas.(我出國旅游之后一周都會有時差反應。)

If jet lag or extreme schedule changes leave you exhausted, make your travel workout shorter or lighter than usual.(如果時差或巨大的日程差別讓你感到疲勞，那么就減少你的旅行鍛煉或者比平時減輕些。)

You look tired. Maybe it's jet lag from yesterday.(你看起來很疲勞，昨天的時差還沒倒過來吧。)

As a result, people are left with symptoms similar to the effects of jet lag.(結果就是，人們出現了類似時差反應的癥狀。)

Jet lag is a problem every international traveler may come across.(時差反應是每一個國際旅行者都可能遇到的問題。)

Jet lag is caused because the body clock does not readjust immediately to the time change.(時差是因為生物鐘沒有立即適應時間的改變而引起的。)

Helpfully the scientists have come up with a name for the phenomenon - 'social jet lag'.(科學家們為這個現象總結出了一個名稱——‘社會時差’。)