![]() ![]() Our sleep cycle begins with phases one and two, which are stages of light sleep where our brain waves slow down and transition from an Alpha to a Theta wave state of 4-8 Hz. If we are awake but highly relaxed, our brain waves slow down to an Alpha state between 9-12 Hz. When we are in a regular waking state, we experience Beta brain waves of 14-30 Hz. Scientists discovered the different sleep phases by measuring changes in the electrical activity of the brain during sleep using an electroencephalogram (EEG). Phases one to three are called NREM (non-rapid eye movement) sleep, while phase four is the well-known REM (rapid eye movement) sleep. When we sleep, we go through several sleep cycles about every 80 to 110 minutes, each of which is made up of four phases. Keep reading to learn about the different stages of sleep, why deep sleep is important and how you can get more of it. Our body and mind work to restore, regenerate and process information during sleep so that we can function optimally in daily life. However, we now know that quality sleep is a complicated, dynamic physiological process that is anything but passive. It was thought that the body and mind became inactive during sleep to rest and recover from the day’s activity. That may sound boring, but this unconscious state is actually much more interesting than previously thought.Īs recently as 70 years ago, researchers assumed the human body went into a dormant state during sleep. It’s estimated that humans spend about a third of our lives sleeping. South Georgia & South Sandwich Islands (GBP £) ![]()
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