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Sleep Deprivation Triggers Brain's 'Cleaning Mode' During Wakefulness

1/22/2026

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Summary

Story summary

Massachusetts Institute of Technology researchers report that sleep deprivation may trigger a sleep-like cleaning mode in the brain during wakefulness.
Cerebrospinal fluid movement, active during deep sleep, intrudes into wakefulness when sleep is lacking.
This intrusion slows reaction times and causes missed signals in attention tests.
The study links attention failures to a body-wide event potentially involving the noradrenergic system, and the brain tries to restore cognition by mimicking sleep.

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Story summary

Massachusetts Institute of Technology researchers report that sleep deprivation may trigger a sleep-like cleaning mode in the brain during wakefulness.
Cerebrospinal fluid movement, active during deep sleep, intrudes into wakefulness when sleep is lacking.
This intrusion slows reaction times and causes missed signals in attention tests.
The study links attention failures to a body-wide event potentially involving the noradrenergic system, and the brain tries to restore cognition by mimicking sleep.