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Mitochondria set 'ancient' metabolic thermostat for sleep in flies, separate from circadian rhythms

Mitochondria set 'ancient' metabolic thermostat for sleep in flies, separate from circadian rhythms
Update: 2025-09-09
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During waking hours, a specialized set of sleep neurons in the fly brain accumulates reactive oxygen species, which eventually trigger sleep to clean up and repair the damage they do.
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