Our sleep schedules do vary from person to person, depending in large part on the environmental cues we give our bodies — when we set our alarms, when we are most active during the day, when we eat, and when we let ourselves hit the pillow.
Each of us operates on a biological schedule that plays a big role in when we feel tired and when we feel awake. When our internal sleep clock is functioning normally, it sends our bodies signals to sleep in the evening and wake in the morning.
However, sometimes this sleep clock can fall out of sync, throwing your regular schedule out of whack.
This can affect your overall sleep quality while also making it difficult to fall asleep and wake up at the right times, ultimately leaving you sleep deprived or with “social jetlag” that can affect performance and moods.
As far as timing goes, normal biological variation exists, with some people naturally predisposed to earlier sleep-wake times and others to later sleep-wake times. To an extent, genetics influence sleep habits but behaviors and the environment also play a role.