Trait
Drowsiness
Abnormal feeling of sleepiness or difficulty staying awake.
Summary
- Also called
- Sleepy, Abnormal drowsiness, Sleepiness, Somnolence
- Body system
- Abnormality of the nervous system
Reference genomeGRCh38hg38
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Get my Genome Test35 genes linked to Drowsiness
Changes in these genes cause rare conditions in which Drowsiness is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.
| Gene | How often it is seen | Conditions |
|---|---|---|
| FDXRferredoxin reductase | Always | In 1 condition |
| GFAPglial fibrillary acidic protein | Always | In 1 condition |
| MAN2B2mannosidase alpha class 2B member 2 | Always | In 1 condition |
| NDUFS8NADH:ubiquinone oxidoreductase core subunit S8 | Always | In 1 condition |
| SGSM3small G protein signaling modulator 3 | Always | In 1 condition |
| SLC13A3solute carrier family 13 member 3 | Always | In 1 condition |
| UBAP2Lubiquitin associated protein 2 like | Always | In 1 condition |
| HNF4Ahepatocyte nuclear factor 4 alpha | Very often (80–99%) | In 1 condition |
| ZNHIT3zinc finger HIT-type containing 3 | Very often (80–99%) | In 1 condition |
| ABCC8ATP binding cassette subfamily C member 8 | Often (30–79%) | In 2 conditions |
| ASLargininosuccinate lyase | Often (30–79%) | In 1 condition |
| CACNA1Acalcium voltage-gated channel subunit alpha1 A | Often (30–79%) | In 2 conditions |
| HMGCL3-hydroxy-3-methylglutaryl-CoA lyase | Often (30–79%) | In 1 condition |
| HNF1AHNF1 homeobox A | Often (30–79%) | In 1 condition |
| KCNJ11potassium inwardly rectifying channel subfamily J member 11 | Often (30–79%) | In 1 condition |
| MTRR5-methyltetrahydrofolate-homocysteine methyltransferase reductase | Often (30–79%) | In 1 condition |
| OTCornithine transcarbamylase | Often (30–79%) | In 1 condition |
| SLC19A3solute carrier family 19 member 3 | Often (30–79%) | In 1 condition |
| SLC25A13solute carrier family 25 member 13 | Often (30–79%) | In 1 condition |
| SPRsepiapterin reductase | Often (30–79%) | In 1 condition |
| UCP2uncoupling protein 2 | Often (30–79%) | In 1 condition |
| FBP1fructose-bisphosphatase 1 | Sometimes (5–29%) | In 1 condition |
| INPP4Ainositol polyphosphate-4-phosphatase type I A | Sometimes (5–29%) | In 1 condition |
| LONP1lon peptidase 1, mitochondrial | Sometimes (5–29%) | In 1 condition |
| MAN2B1mannosidase alpha class 2B member 1 | Sometimes (5–29%) | In 2 conditions |
| MT-CYBmitochondrially encoded cytochrome b | Sometimes (5–29%) | In 1 condition |
| NAGSN-acetylglutamate synthase | Sometimes (5–29%) | In 1 condition |
| PCK1phosphoenolpyruvate carboxykinase 1 | Sometimes (5–29%) | In 1 condition |
| PCK2phosphoenolpyruvate carboxykinase 2, mitochondrial | Sometimes (5–29%) | In 1 condition |
| PDHA1pyruvate dehydrogenase E1 subunit alpha 1 | Sometimes (5–29%) | In 1 condition |
| PIGGphosphatidylinositol glycan anchor biosynthesis class G (EMM blood group) | Sometimes (5–29%) | In 1 condition |
| PPP2R5Cprotein phosphatase 2 regulatory subunit B'gamma | Sometimes (5–29%) | In 1 condition |
| PTS6-pyruvoyltetrahydropterin synthase | Sometimes (5–29%) | In 1 condition |
| ATP1A2ATPase Na+/K+ transporting subunit alpha 2 | Not recorded | In 1 condition |
| THRAthyroid hormone receptor alpha | Not recorded | In 1 condition |
How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.
Broader traits
Where this comes from
- The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
- Data release 2026.10.16-c6eea6bf.
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