Research
Adherence
Using sleep diaries or event markers to define Time in Bed (TIB) and Sleep Period (SLP) significantly improves the accuracy of actigraphy-derived sleep parameters compared to using algorithm-defined boundaries alone.
To get the most accurate sleep data from your actigraphy device, use the event marker button or a sleep diary to log when you get in bed, turn off the lights, and get up. This helps the device distinguish between 'time in bed' and 'actual sleep time,' correcting for errors in sleep latency and efficiency calculations.
GoodSupportsHIGH confidence
Sleep diary data are particularly important in determining ‘lights off’ (which signals start of the SLP), information critical for accurate assessment of sleep latency and SE (Smith et al., 2018).
Why this rating
Based on explicit recommendations and citations of validation studies.
Source
Actigraphy-Based Assessment of Sleep Parameters
Desta Fekedulegn et al. · Annals of Work Exposures and Health · 2020
DOI 10.1093/annweh/wxaa007
narrative_reviewCited 257×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Actigraphy provides a valid, cost-effective, and less invasive alternative to polysomnography (PSG) for estimating sleep parameters in population-based epidemiological studies, with agreement rates of 91-93% in adults.Good
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