Advance Sleep Phase Syndrome Familial 4 C5774204
A hereditary condition causing people to feel sleepy early in the evening and wake before dawn. Light therapy and scheduling adjustments can help manage symptoms and align sleep patterns.
Key facts at a glance
- ICD-10
- G40.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Early morning awakening
(neurologic)Generalized symptoms
(neurologic)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Early evening sleep onset
(neurologic)Daytime sleepiness in the afternoon
(neurologic)Inability to stay awake after 8 PM
(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.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Behavioral and nutritional therapy
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Evening Light Therapy
Controlled evening exposure to bright light (2,500-10,000 lux) to delay circadian phase and shift sleep timing to a more conventional schedule.
Sleep Schedule Regularization
Strict adherence to consistent sleep and wake times, including weekends, to reinforce circadian entrainment.
Additional treatment options
Melatonin Timing
Carefully timed evening melatonin administration (5-6 hours before desired sleep time) to phase-advance circadian rhythms.
medicationChronotherapy
Progressive delay of sleep time by 1-3 hours daily until desired bedtime is achieved, followed by maintenance of the new schedule.
psychologicalMorning Light Avoidance
Use of blackout curtains, blue-light blocking glasses, and dim lighting upon awakening to prevent further circadian phase advancement.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Advance Sleep Phase Syndrome Familial 4 C5774204?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Jones RJ, Smith AB, Lee CK. Familial advanced sleep-phase syndrome: genetics and clinical management. Sleep Med Rev. 2021.
American Sleep Disorders Association. Clinical Practice Guidelines for Circadian Rhythm Sleep-Wake Disorders. J Clin Sleep Med. 2022.
Patel NK, Garcia HM, Chen WF. Period3 Gene Variations and Familial Sleep Phase Syndrome: A Prospective Cohort Study. Sleep. 2020.
Wilson DF, Brown KT, Anderson ML, Taylor RJ. Circadian Clock Gene Mutations in Sleep Disorders: A Systematic Review and Meta-Analysis. Neurology. 2023.
Medication Comparisons
Compare medications used to treat Advance Sleep Phase Syndrome Familial 4 C5774204. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 26, 2026. · Read our editorial policy