Traveling or busy work schedule
Always working late for multiple shifts, traveling from one time zone to another time zone for successive days, or changing in the work shifts disturbs your sleep-wake cycle by affecting your circadian rhythm. The circadian rhythms of the body act as the inner clock of yours that guides the body to have regularity in your sleep-wake cycle, body temperature, and metabolism. Whenever the regular schedule of the person affects, the circadian rhythms also start causing the disruption in the sleeping time. So no matter how hard you are trying to get asleep, you are not able to fall asleep due to these disturbances in your circadian rhythms.