Caring for someone with this diagnosis? Eleplan keeps diagnoses, medications, documents and every specialist in one plan.
Start free with EleplanFamilial advanced sleep-phase syndrome
ORPHA:164736Disease
Also called FASPS
What it is
A rare genetic neurological disorder characterized by very early sleep onset and offset. Plasma melatonin levels and body core temperature rhythms are also phase-advanced. The sleep-wake cycle is generally shortened. Additional reported features include migraine with or without aura and seasonal affective disorder.
Key facts
- Age of onset
- Adolescent, Childhood
- Inheritance
- Autosomal dominant
- Classified as
- Disease
Genes
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
Powered by Eleplan
A rare diagnosis is just the start. Eleplan keeps the whole care plan in one place.
Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, so you are not retelling the same story to every new specialist. With Ellie, your AI care assistant, on top of it. Free to start.