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Insomnia, also known as sleeplessness, is a sleep disorder where people have trouble sleeping. [1] [11] They may have difficulty falling asleep, or staying asleep for ...
Psychophysiological insomnia is anxiety-induced. Idiopathic insomnia generally begins in childhood and lasts for the rest of a person's life. It's suggested that idiopathic insomnia is a neurochemical problem in a part of the brain that controls the sleep-wake cycle, resulting in either under-active sleep signals or over-active wake signals.
A thesaurus (pl.: thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where one can find different words with similar meanings to other words), [1] [2] sometimes as a hierarchy of broader and narrower terms, sometimes simply as lists of synonyms and antonyms.
Onset insomnia is characterized by difficulty falling asleep at night, leaving people tossing and turning for hours. Maintenance insomnia involves the inability to stay asleep throughout the night ...
Insomnia disorder (primary insomnia), chronic difficulty in falling asleep or maintaining sleep when no other cause is found for these symptoms. Insomnia can also be comorbid with or secondary to other disorders. Kleine–Levin syndrome, a rare disorder characterized by persistent episodic hypersomnia and cognitive or mood changes. [84]
Insomnia is the most common sleep problem, with many adults reporting occasional insomnia, and 10–15% reporting a chronic condition. [117] Insomnia can have many different causes, including psychological stress , a poor sleep environment, an inconsistent sleep schedule, or excessive mental or physical stimulation in the hours before bedtime.
An online dictionary is a dictionary that is accessible via the Internet through a web browser. They can be made available in a number of ways: free, free with a paid subscription for extended or more professional content, or a paid-only service.
Roger in 1932 coined the term parasomnia and classified hypersomnia, insomnia and parasomnia. [3] Kleitman in 1939 recognized types of parasomnias as nightmares, night terrors , somniloquy (sleep-talking), somnambulism (sleepwalking), grinding of teeth , jactatians, enuresis , delirium , nonepileptic convulsions and personality dissociation. [ 4 ]