Sleep Diaries Complement Wearable Trackers
Key takeaway
A sleep diary is a nightly self-report log of sleep timing and quality; it often overestimates sleep versus PSG but still adds useful subjective detail alongside wearables.
- Nightly logs of bedtime, wake time, awakenings, and perceived quality.
- People usually report more sleep than PSG measures.
| Finding | Scientific Observation | Impact Magnitude | ||
|---|---|---|---|---|
| Diary vs PSG TST | Diaries overestimate sleep duration | Common bias | ||
| Clinical use | Moderate agreement for trends | Useful monitoring | ||
| +10–20% accuracy claim | Not a validated universal figure | Removed |