The claim
A familiar public story: phones steal teenagers’ sleep. Hale and Guan (2015), in a systematic review, found that screen use is associated with delayed bedtime and shortened sleep in school-aged children and adolescents, with mechanisms that include displacement of sleep opportunity, arousal, and evening light. Associations are not destiny. Reverse causality is plausible: sleep problems can drive late-night use. Self-report inflates error.
Takeaway
Design for wind-down: batch notifications, reduce evening luminance defaults, treat sleep opportunity as a first-class constraint. The useful question is not “how many hours of screen?” It is what the device is doing to arousal at the wrong time of day.
This digest is not clinical advice.
Evidence & provenance2 sources · production record
Source record
Sources stay inspectable so the boundary between reporting and interpretation remains visible.
- 01
- 02PSYTECH News editorial constitution — PSYTECH — House method: scene → claim → named evidence → implication. Editorial, not clinical.
Production
Editorial production
Human review
Not recorded for this release