REM sleep acts as an electrical fertilizer, stimulating the growth of connections in the brain, which is essential during infancy.

By age five or six, the ratio of REM to non-REM sleep stabilizes to about 20% REM and 80% non-REM, which remains consistent throughout adulthood.

As we age, our sleep architecture changes, with infants experiencing highly polyphasic sleep, transitioning to biphasic and eventually monophasic sleep patterns in childhood.

Phase three of the day, 16 to 24 hours after waking, is crucial for neuroplasticity and habit consolidation, requiring a low-light environment to support deep sleep.

Improving REM sleep is crucial, as it is often the first phase affected by stress; strategies to enhance it can lead to better overall sleep quality.

Studies indicate that polyphasic sleep can significantly reduce REM sleep and overall sleep efficiency, making it an unwise choice for adults.

You spend a third of your life sleeping, so it's essential to prioritize sleep as it forms the foundation for all other longevity therapies.

Between the 15th and 19th centuries, some European cultures, particularly in Great Britain, practiced a form of sleep where people would wake up after about four hours of sleep to engage in various activities like eating, playing music, and writing.

Sleep is the foundation of mental health, physical health, and performance, influencing cognitive abilities, immune function, and longevity.