Is 2 Hours of Sleep Better Than Pulling an All-Nighter Before an Exam?
Yes. Sleeping for 90 to 120 minutes is 40-50% better for exam performance than zero sleep. A single 90-minute sleep cycle allows the brain to complete Slow-Wave Sleep (SWS) and REM sleep, clearing adenosine sleep pressure and consolidating temporary memories into the cortex.
It's 3:30 AM. Your exam is in 5 hours. Should you stay up until test time, or sleep for 2 hours?
A single 90-minute sleep cycle flushes metabolic waste via the glymphatic system and solidifies crammed facts into hippocampal circuits.
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