Can you have severe sleep inertia?
Yes. Severe sleep inertia ('sleep drunkenness') involves marked confusion and great difficulty functioning after waking, sometimes for an hour or more. It is common in hypersomnolence disorders, especially idiopathic hypersomnia, and difficulty waking is also reported more often by people with mood disorders.
Symptoms of severe inertia
Confusion, disorientation, slowness and great difficulty getting going, sometimes with a strong urge to go back to sleep, lasting from many minutes to hours after waking (Trotti, 2017).
Common causes
Hypersomnolence disorders, especially idiopathic hypersomnia, are the classic cause, and difficulty waking is also common with mood disorders (Trotti, 2017). Prior sleep loss makes ordinary sleep inertia worse (Hilditch & McHill, 2019). Untreated sleep apnea and sedating medications are worth ruling out with a doctor, and so is alcohol before bed, which disrupts the second half of the night.
What to do
Audit sleep duration, schedule, and substances first. If severe inertia persists despite 7+ hours of clean sleep, consult a sleep specialist.
Sources
- Trotti, Sleep Medicine Reviews, 2017. Waking up is the hardest thing I do all day: Sleep inertia and sleep drunkenness
- Hilditch & McHill, Nature and Science of Sleep, 2019. Sleep inertia: current insights
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