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When you travel (1) .... the other side of the world, jet lag is a real problem. You find yourself away (2) .... the middle of the night and you feel like going to bed (3) .... the morning, just when everyone around you ius getting up.
Jetlag happens when you go (4) .... a country where the time is very different. For example, you might leave London (5) ..... midday amd fly (6) .... Los Angeles. The flight takes about eleven hours, so when you arrive (7) .... Los Angeles airpot, your body thinks you're there (8) .... 3 pm local time. So, (10) midnight Los Angeles time, your body (which still thinks it's (11) .... London) says it's 8 am. It takes a few days for your body clock to change.