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Phone Use After 10 p.m. Cuts Teen Sleep by 20 Minutes

By Drooid · Oct 21, 2026, 3:33 PM UTC · How we work

Summary

Story summary

U.S. researchers found that teen smartphone use after 10 p.m. delays sleep onset and shortens total sleep.
The researchers monitored 425 teens, average age 15, for nearly 7,600 nights using wearables and an app.
When phone use after 10 p.m. was above average, teens slept 20 minutes less and fell asleep 64 minutes later.
Researchers advise stopping phone use after 10 p.m. and substituting calming activities like reading or stretching.

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Story summary

U.S. researchers found that teen smartphone use after 10 p.m. delays sleep onset and shortens total sleep.
The researchers monitored 425 teens, average age 15, for nearly 7,600 nights using wearables and an app.
When phone use after 10 p.m. was above average, teens slept 20 minutes less and fell asleep 64 minutes later.
Researchers advise stopping phone use after 10 p.m. and substituting calming activities like reading or stretching.