Sleep Cycles: Definition and the 90-Minute NREM-REM Architecture
Sleep cycles are 90-minute NREM-REM units repeating 4-6 times per night. Understand how their architecture determines memory, recovery, and performance.
Most high performers are functionally sleep-deprived, eroding their executive function and emotional regulation. This protocol breaks down the architecture of sleep stages and provides a step-by-step system for circadian alignment using light and temperature. By mastering the “10-3-2-1” rule, you can transform sleep from a passive activity into an active recovery strategy.
Sleep cycles are 90-minute NREM-REM units repeating 4-6 times per night. Understand how their architecture determines memory, recovery, and performance.
REM sleep is the sleep stage of rapid eye movements, muscle atonia, and vivid dreaming. It makes up 20-25% of adult sleep and underlies emotional memory.
The science of melatonin decoded, 44 peer-reviewed sources on timing, dosing, light exposure, and why most people use it wrong. Deep dive.