SLEEP0079 Irregular Sleep Impairs Verbal and Memory Abilities in Early Childhood

⚠️ Small Study / Early Comparative Evidence

A conference abstract from SLEEP 2026 examined sleep regularity measured via actigraphy-derived midpoint variability, duration variability, and social jetlag and its relationship to three cognitive domains in 379 preschool-age children (mean age 4.3 years).

Clinical Considerations

• Receptive vocabulary (PPVT-4, n=322) was significantly associated with all three irregularity measures, even after controlling for total sleep duration.
• Visuospatial memory accuracy was linked to sleep midpoint variability (r=–0.30) and social jetlag (r=–0.45), but not duration variability; subsample was small (n=62).
• Executive attention showed no association with any sleep regularity measure, suggesting domain-specific cognitive vulnerability.
• Social jetlag, defined as the discrepancy between weekday and weekend sleep timing, carried the strongest association with vocabulary scores (r=–0.26).

Practice Applications

• Consider asking about sleep consistency alongside total duration when screening for developmental language concerns in preschoolers.
• Recognize social jetlag as a clinically relevant, often overlooked regularity marker distinct from sleep duration.
• Interpret memory findings cautiously given subsample sizes; verbal findings are better powered and more actionable.