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![TheEconomist Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::5988062.png) The Economist [@TheEconomist](/creator/twitter/TheEconomist) on x 27.1M followers
Created: 2025-07-19 21:40:11 UTC

Sleepiness may be driven by metabolic stress in the brain, not just fatigue

![](https://pbs.twimg.com/card_img/1945569343258955777/Jf1XOvO9?format=jpg&name=800x419)

XXXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1946686531067896157/c:line.svg)

[Post Link](https://x.com/TheEconomist/status/1946686531067896157)