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sleeplessness

sleeplessness Sleeplessness, or insomnia, is an inability to sleep, especially a marked shortfall from a person’s usual sleep.

Sleeplessness, or insomnia, is an inability to sleep, especially a marked shortfall from a person’s usual sleep. In this historical source, the term is used mainly for a more lasting problem, often linked to nervous disturbance, though poor sleep can involve reduced quality as well as reduced amount.

Also see

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Insomnia” (Insomnia).
public-domain-US · Definition uses new wording; original source retains its stated licence. · Source snapshot SHA-256: ce6993ed4b403db614d99e06b87d13f02c678be12d4c5a61c4a8e966703b3181

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PsychTerms (psychterms.org), CC BY 4.0, version 1. “sleeplessness.” Development preview.

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