Sleep Health

Sleep Deprivation Symptoms: Short-Term and Long-Term Effects

What happens to your body and brain when you sleep less than 7 hours night after night.

February 20, 2026•6 min read•Sleep Health

24 hours awake

Cognitive performance equals a 0.10% blood alcohol level — legally impaired.

One week under 6 hours

Measurable drops in memory consolidation, immune function and emotional regulation.

One month chronically short

Insulin resistance rises, appetite hormones shift, and depression risk doubles.

Long-term consequences

Increased risk of dementia, heart disease, type 2 diabetes and early mortality.

Recovery is possible

Most people feel restored within 4–7 nights of consistent 8-hour sleep.

Editorial standards

Last reviewed February 2026 against current US sleep medicine guidelines by the Sleep Disorder Symptoms editorial team. This article is educational and is not medical advice — see our medical disclaimer and editorial policy.

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