Wake Up Time
clock time
The clock timestamp of final awakening from the primary sleep period.
Typical optimal range 6:00 AM - 8:00 AM
Population median 7:15 AM
Key factors
- Alarm and work schedule
- Accumulated sleep debt
- Natural circadian rhythm
What affects this metric
- Blackout curtains and a dark room delay spontaneous waking.
- Morning light on waking anchors the time day to day.
- Final awakening moves earlier with age.
- Alarms, light leaking into the room, and noise set wake time.
- Alcohol and a late meal cause earlier final awakening.
References
Peer-reviewed sources supporting the key factors, contributing factors, and typical optimal range shown above.
- Ohayon MM, Carskadon MA, Guilleminault C, Vitiello MV. Meta-analysis of quantitative sleep parameters from childhood to old age in healthy individuals. Sleep. 2004;27(7):1255–1273. doi.org/10.1093/sleep/27.7.1255
- Duffy JF, Czeisler CA. Effect of light on human circadian physiology. Sleep Medicine Clinics. 2009;4(2):165–177. doi.org/10.1016/j.jsmc.2009.01.004
- Wittmann M, Dinich J, Merrow M, Roenneberg T. Social jetlag: misalignment of biological and social time. Chronobiology International. 2006;23(1–2):497–509. doi.org/10.1080/07420520500545979
This guide is general information, not medical advice. Talk to your clinician about your own results.