Evidence-based guidelines recommend that adults should sleep 7-9hrs per/night. This study used multi-night, in-home, objective sleep duration monitoring to determine how often a large global community sample meets the recommended sleep duration range.
Data were analysed from registered users of the Withings Sleep Analyzer under-mattress device who had ≥28 nights of sleep recordings, averaging ≥4 per week. Sleep durations were assessed as the average and standard deviation of sleep duration across a ~9-month period. Proportions of participants within (7-9hrs) or outside (<7hrs or >9hrs) the recommended sleep duration range were calculated. Associations between age groups, sex, and sleep duration were assessed using linear and logistic regressions.
In total, data were analysed from 67,254 adults (52,523 males, 14,731 females; aged Mean±SD 50±12y). About 30% of the sample showed an average sleep duration outside the recommended 7-9hrs per/night. Even in participants with an average sleep duration within 7-9hrs, about 40% of recorded nights were outside this range, and only 15% of participants slept between 7-9h for at least 5 nights per/week. Females had significantly longer sleep durations than males, and middle-aged participants had lower sleep durations than younger and older participants.
A considerable proportion of adults in this sample were not regularly sleeping the recommended 7-9hrs per/night. Even amongst those who do, irregular sleep is prevalent. These novel data raise several important questions regarding sleep requirements, lifestyle factors, and the need for improved sleep health policy and advocacy.