Maintaining focus for longer than 90 minutes can be challenging because the brain operates on the so-called ultradian rhythms of 90-minute cycles. If you're studying and trying to focus, try to get all distractions out of the way and drop into a learning bout of 90 minutes or less.
For example, doing a 10-minute NSDR protocol to help you relax and focus (#NSDR Protocol - Dr. Andrew Huberman - • #NSDR (Non-Sleep Deep Rest) with Dr. ... ).
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