Sleep
Polyphasic Sleep Risk
Polyphasic sleep risk is harm from fragmented short naps replacing nightly sleep—usually worse for cognition, metabolism, and training than consolidated rest.
Polyphasic sleep risk comes from splitting rest into many short naps to cut total sleep—popular online but linked to cognitive impairment, metabolic strain, and training under-recovery in real-world use. Most athletes and knowledge workers need consolidated nightly sleep.
Not a productivity hack.
Common questions
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Is polyphasic sleep ever safe?
Evidence for sustainable benefit in healthy adults is weak. Shift workers may use controlled naps, but cutting total sleep below need carries clear performance and health risks.
Related terms
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