Research
Adherence
Social Jet Lag (SJL) measures weekly differences in sleep timing (workdays vs. free days) and is insensitive to day-to-day variability.
Use Social Jet Lag (SJL) only if you want to measure the difference between your workday and weekend sleep schedules. Do not use SJL to assess day-to-day consistency, as it will not detect daily fluctuations in sleep timing or duration.
GoodSupportsHIGH confidence
SJL is a measure of weekly but not daily sleep regularity.
Why this rating
Demonstrated through simulation scenarios where daily variation was introduced while SJL remained constant.
Source
Measuring sleep regularity: theoretical properties and practical usage of existing metrics
Dorothee Fischer et al. · SLEEP · 2021
mechanism_onlyCited 189×
Read the paper This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →