or emotional distress. And extreme sleep deprivation like jetlag can throw off your biological clock, wreaking havoc on your sleep schedule.
What causes insomnia? - Dan Kwartler
How native speakers pronounce “jetlag”
1 example from real videos — listen, replay, loop.
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or emotional distress. And extreme sleep deprivation like jetlag can throw off your biological clock, wreaking havoc on your sleep schedule.
What causes insomnia? - Dan Kwartler