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90-minute focus blocks
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Last discussed Oct 27, 2026
Working in focused sessions of about 90 minutes, matching the brain's natural 90–110 minute alertness cycle.
Recently discussed in
No.1 Flow Expert: How to Enter Deep Lock-In Mode
Steven Kotler · Oct 27, 2026
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Steven Kotler
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Used for: Training focus for flow
Praised: Matches the brain's biological alertness cycle; you can build up gradually fr...
vs: Compared to the 90–110 minute REM sleep cycle
"You have an awake and alert cycle. It's the exact same, like this 90 to 110 minutes long. Your brain is biologically designed to focus for 90-minute slots. So I always tell people, when we're training them in flow, start by starting. If you can on..."
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