The 90-Minute Sleep Rule nobody taught you:Sleep runs in cycles — not hours.
Each cycle = 90 minutes.
Interrupt one mid-cycle and you wake up groggy even after 8 hours.
This is why 7.5 hours feels better than 8.
This is why a 20-min nap works but a 45-min one wrecks you.
Calculate your bedtime backward:
🟢 Wake at 6am → sleep by 10:30pm or 12am (not 11pm)
🟢 Wake at 7am → sleep by 11:30pm or 1am
The number of cycles matters more than raw hours.
6 full cycles (9 hours) → peak
5 cycles (7.5 hours) → functional
4 cycles (6 hours) → minimum viable
Stop chasing 8 hours.
Start finishing cycles.
🗂 Source: @Primaltips
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