What question did this study set out to answer?

To quantify global real-world sleep schedules and assess how social pressures interact with endogenous circadian rhythms to alter sleep timing and duration.

May 6, 2016Science AdvancesOpen Access

A global quantification of “normal” sleep schedules using smartphone data

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Authors

OWOlivia WalchUniversity of Michigan ACAmy L. CochranUniversity of Minnesota DFDaniel B. ForgerUniversity of Michigan

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Implication

Observational smartphone study reveals social pressures delay bedtime and shorten sleep duration across global populations, highlighting societal disruptions to circadian rhythms.

Key Points

To quantify global real-world sleep schedules and assess how social pressures interact with endogenous circadian rhythms to alter sleep timing and duration.
Collected international sleep timing and environmental light exposure data using the ENTRAIN mobile smartphone application.
Utilized mathematical modeling and statistical analyses to compare real-world sleep behaviors against laboratory-based circadian model predictions.
Social pressures selectively delay bedtime and shorten sleep duration, with a nation's average bedtime predicting total sleep duration while average wake time does not.
Women schedule more sleep than men, and individuals exposed primarily to outdoor light report earlier bedtimes and longer sleep durations than those in indoor lighting.
Age is the primary determinant of sleep timing and drives population-level schedule variability, with laboratory circadian model effects showing real-world attenuation around bedtime.

Cite This Study

Walch et al. (2016) studied this question.

synapsesocial.com/papers/69d73fd2c74376700bf3115c https://doi.org/10.1126/sciadv.1501705

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Implication

Observational smartphone study reveals social pressures delay bedtime and shorten sleep duration across global populations, highlighting societal disruptions to circadian rhythms.

A global quantification of “normal” sleep schedules using smartphone data

Discussion

Member takes

Implication

Key Points

Cite This Study

A global quantification of “normal” sleep schedules using smartphone data

Discussion

Member takes

Implication

Key Points

Cite This Study

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