Light Sleep (N1+N2)
Stages 1 and 2 non-REM sleep as % of total sleep
Sleep ArchitectureCategory
About 50% of total sleepReference
About half of the nightSourced reference
Why Light Sleep (N1+N2) matters
Transition sleep stages. Too much light sleep at expense of deep/REM indicates poor sleep quality.
Reference Range
About 50% of total sleep
Sourced reference
About half of the night
Targets by source
Each position below is attributed and linked to the document that states it. Several are population percentiles or averages rather than targets; the note says which. How we verify ranges.
- About 50% of the nightOura Ring sleep-stage guide (device vendor)Oura sells the ring that reports these stages and estimates them from heart rate, movement and temperature, not brain activity. A typical average, not a clinical target.
Devices that measure this
Devices in our comparisons whose published specs list this metric:
Track Your Sleep Architecture
Monitor Light Sleep (N1+N2) with wearables and health tracking devices
Health Disclaimer
This information is for educational purposes only. Consult a healthcare provider for personalized health recommendations.
Last reviewed Sep 23, 2026 · First published Oct 1, 2025