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rhythm – n. a regular, repeated pattern of events, changes, activities, etc.
circadian – adj. relating to the regular changes in a person or thing that happen in 24-hour periods
adapt – v. to change your behavior so that it is easier to live in a particular place or situation
clock – n. a device that shows what time it is and that is usually placed in a room or attached to a wall
jet lag – n. a tired and unpleasant feeling that you sometimes get when you travel by airplane to a place that is far away
time zone – n. any one of the world's 24 divisions that has its own time
giant – n. a legendary creature usually thought of as being an extremely large and powerful person
humbling – adj. feeling less important, less proud
