Telemonitored sleep quality and daily activity are associated with mental health outcomes among Japanese workers.

Longer sleep onset latency (SOL) was correlated with higher distress and life interference scores.

• 81 Japanese adults participated in the study
• Participants wore a Fitbit Sense 2 for five days to monitor daily activity
• One night of sleep electroencephalography was conducted for each participant
• Distress and life interference were assessed using questionnaires

Sleep efficiency (SE) was negatively associated with distress interference.

• Sleep efficiency was among the sleep metrics monitored via Fitbit Sense 2 and EEG
• Higher SE was associated with lower distress interference scores
• The sample consisted of 81 Japanese adults

Decreased N2 sleep was linked to elevated anxiety and depression scores.

• Sleep stages were assessed using one night of sleep electroencephalography
• N2 sleep reduction was associated with both higher anxiety and higher depression scores
• Anxiety and depression were assessed using standardized questionnaires

Increased N3 sleep was correlated with lower harm avoidance scores.

• N3 sleep (slow-wave sleep) was measured via overnight sleep EEG
• Harm avoidance was assessed using questionnaires
• Higher N3 sleep duration was associated with lower harm avoidance

Higher total sleep time (TST) was associated with reduced insomnia severity.

• TST was one of the sleep metrics monitored in the study
• Insomnia severity was assessed via sleep symptom questionnaires
• The relationship was observed across 81 Japanese adult participants

Vigorous physical activity was associated with lower harm-avoidance scores.

• Daily activity levels were monitored using a Fitbit Sense 2 worn for five days
• Vigorous activity specifically was inversely associated with harm avoidance
• Harm avoidance was assessed using questionnaires

Subjective ratings of sleep restorativeness were positively related to both vigorous activity and mental health outcomes.

• Subjective ratings of daily sleep-restorativeness were collected alongside objective measures
• Higher restorativeness ratings correlated with greater vigorous activity levels
• Restorativeness ratings were also positively associated with better mental health outcomes
• This finding links subjective sleep perception to both objective activity and mental health measures

The study used a combined methodology of wearable telemonitoring and overnight EEG to objectively assess sleep and activity in relation to mental health.

• 81 Japanese adult workers participated
• Participants wore Fitbit Sense 2 devices for five days for activity and sleep monitoring
• One night of sleep EEG provided objective sleep stage data
• Mental health outcomes assessed included distress, anxiety, depression, harm avoidance, and sleep symptoms via questionnaires