Rare diseases · Sign or symptom
Bilateral tonic-clonic seizure on awakening
Morning generalized tonic-clonic seizures
HP:0007193
What it means
Bilateral tonic-clonic seizure of either generalized or focal onset occurring on or soon after wakening (typically within 90 minutes of waking, regardless of the time of day).
Rare diseases that can present with this1
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Generalised tonic-clonic seizures on awakening · Generalized tonic-clonic seizures on awakening · Morning generalised tonic-clonic seizures
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.