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
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Excessive daytime sleepiness
(neurologic)Generalized symptoms
(neurologic)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Difficulty concentrating
(neurologic)Feeling unrefreshed after sleep
(neurologic)Non-restorative sleep
(neurologic)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Medication Comparisons
Compare medications used to treat Prolonged N1 Sleep C5873012. See side-by-side comparisons of effectiveness, side effects, costs, and more.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy