Jet Lag - NASA-HUNCH-HeritageHS/jets-101 GitHub Wiki

Jet lag is a problem that people who travel face because when you fly through multiple timezones the time that you are in at the place is different from your bodies internal time, the time you are used to. Depending on where you go can effect how much of a problem it can be. Sometimes it's just an hour or two sometimes it can be so bad you are awake at night and feel fatigue during the day.