Challenges in Using Parent-Reported Bed and Wake Times for Actigraphy Scoring in Rett-Related Syndromes.

The team asked caregivers of children with Rett-related syndromes to write down each night when their child went to bed and woke up.

These notes were meant to help score actigraphy watches that track sleep.

The study then checked how often the notes were missing or did not match the watch data.

Many bed and wake times were missing.

When entries existed, they often disagreed with the watch.

Gaps and errors grew as clinical severity increased.

The diary method proved too unreliable to trust.

Ashworth et al. (2013) saw the same mismatch in Down and Williams syndromes: parent sleep logs missed key wake-ups that actigraphy caught.

Prabhakaran et al. (2024) adds another twist. In Indian families of children with autism, cultural co-sleeping inflated parent questionnaire scores. Together these papers show parent sleep reports can be wrong for different reasons—caregiver stress, culture, or syndrome severity.

Leung et al. (2017) widen the lens. Their review found no standard way to use accelerometers in intellectual disability and flagged poor wear-time. The new Rett data now point to a fix: drop the diary and let the watch score itself.

If you run sleep assessments for kids with severe motor or cognitive limits, do not bank on a caregiver diary. Plan instead for diary-free actigraphy algorithms or automatic scoring. You will save families paperwork and get data you can actually use.