Prolonged N1 Sleep C5873012
N1 sleep is the initial light stage of the sleep cycle. Prolonged N1 sleep means spending excessive time in this stage, which may reduce sleep quality and is often seen with sleep fragmentation.
Key facts at a glance
- ICD-10
- G43.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- mild
- Chronic
- true
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy