Too much sleep is just as bad for your brain as too little, concludes world’s largest sleep study

In 2017, an online portal was established asking participants to complete a comprehensive demographic questionnaire, including estimated sleep duration the night prior, alongside 12 tests designed to evaluate cognitive performance. Excluding incomplete submissions, the researchers ultimately collected data from over 10,000 participants. Around half of all the subjects reported generally sleeping less than 6.3 hours every night, much less than the ultimate recommended amount of between seven and eight hours for optimal cognitive functioning.

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