
1) An inability to stay awake 2) Sleep disorder 3) Sleep disorder
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https://www.crosswordclues.com/clue/hypersomnia

1) Catalepsy 2) Cataleptic 3) Narcolepsy 4) Narcoleptic
Found on
https://www.crosswordclues.com/clue/hypersomnia

In the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders, published in May 2013, hypersomnia appears under sleep-wake disorders as hypersomnolence, of which there are several subtypes. ==Symptoms== The main symptom of hypersomnia is excessive daytime sleepiness (EDS), or prolonged nighttime sleep, which has occurred for at l...
Found on
http://en.wikipedia.org/wiki/Hypersomnia

(from the article `sleep`) Hypersomnia may involve either excessive daytime sleep and drowsiness or a nocturnal sleep period of greater than normal duration, but it does not ...
Found on
http://www.britannica.com/eb/a-z/h/91

Excessive need to sleep. ... (12 Dec 1998) ...
Found on
http://www.encyclo.co.uk/local/20973

(hi″pәr-som´ne-ә) excessive sleeping or sleepiness, as in any of a group of sleep disorders; it can occur with central nervous system damage or as a result of some physical or mental illnesses, such as depression. primary hypersomnia a sleep disorder consisting of persis...
Found on
http://www.encyclo.co.uk/local/21001

Excessive sleepiness, as evidenced by prolonged nocturnal sleep, difficulty maintaining an alert awa
Found on
http://www.encyclo.co.uk/local/22394

Type: Term Pronunciation: hī′pĕr-som′nē-ă Definitions: 1. A condition in which sleep periods are excessively long, but the person responds normally in the intervals; distinguished from somnolence.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=42605

[
n] - an inability to stay awake
Found on
http://www.webdictionary.co.uk/definition.php?query=hypersomnia

hypersomnia (high' pur SAHM nee uh) 1. A condition characterized by abnormally long or frequent periods, or abnormal depth, of sleep. 2. Excessive or uncontrollable sleepiness. 3. A condition in which sleep periods are excessively long, but the person responds normally in the intervals; distinguished from somnolence.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1985/

a tendency to sleep excessively.
Found on
https://www.infoplease.com/dictionary/hypersomnia
No exact match found.