How does evening screen time affect sleep onset?
The scroll that feels relaxing is borrowing from tomorrow.
A screen-free wind-down hour is often associated with a 10–20% relative reduction in time to fall asleep in short interventions.
Study
health
If you…
Stop phone use 60 minutes before bed vs using until lights out
Then…
Time to fall asleep → -10–20%
Context
Adults 18–35, self-reported and wearable sleep, 2020–2025
What changes
A screen-free wind-down hour is often associated with a 10–20% relative reduction in time to fall asleep in short interventions.
When this tends to work
- Conditions similar to: Adults 18–35, self-reported and wearable sleep, 2020–2025
- You can measure
Time to fall asleepreliably - The intervention is implemented consistently, not half-measured
When to be careful
- Your audience or product differs materially from the cited context
- Compliance costs or second-order effects outweigh the lift
- Evidence label is study—treat wide ranges as planning bands, not promises
Practical takeaway
Use the cited range for prioritization and test design. Verify against your own data before scaling.
