Introduction
Now that we have explored the wonders of the circadien rhythm it's time to delve into the intriguing realm of sleep itself. What exactly happens during those nightly adventures into the land of dreams? Let's break it down!
The Symphony of Sleep Cycles
Sleep is a fascinating composition of cycles, taking you on a journey from light sleep to deep sleep and then to the captivating REM sleep before circling back to the lighter stages. These cycles, lasting approximately 90 minutes each, repeat 4-6 times per night, depending on your total sleep duration.
Light Sleep (Stage 1)
The journey begins with light sleep, where you're easily roused. If awakened during this stage, you might question if you were truly asleep.
Intermediate sleep (stage 2)
Progressing further, you descend into intermediate Stage 2 sleep for around 20 to 30 minutes.
Deep Stages (3 and 4)
Roughly 40 minutes into your sleep adventure, you plunge into the deep stages, the most critical phase for rejuvenating your body. It's during this stage that your sleep debt from being awake for 16-18 hours is efficiently repaid. Awakening from deep sleep leaves you feeling disoriented, emphasizing its importance.
Back to the Light
Emerging from the deep sleep, your brainwaves transition to lighter patterns, marking the "up-slope" to the roller-coaster's first hill. About 90 minutes after falling asleep, you enter the captivating realm of Rapid Eye Movement (REM) sleep, where dreams unfold.
The Thrill of REM
REM sleep is the roller-coaster's peak, characterized by active brain patterns and vivid dreams. The first REM episode is brief, lasting 5 to 10 minutes, followed by another sleep cycle, descending into deeper sleep and ascending to the second REM period approximately three hours after the initial slumber.
Diminishing Peaks and Concluding the Ride
As the night progresses, the difference between dips and peaks lessens, mirroring the diminishing thrill of a roller-coaster ride towards its end. Each dip has less deep sleep, while each peak boasts more REM sleep. After around five of these exhilarating 90-minute cycles, you complete your night's journey, usually tallying up to seven to eight hours of sleep for the average young adult.
Conclusion
Embark on the roller-coaster ride of sleep each night, and let your dreams take you on a wild adventure through the peaks and valleys of the night!
