Why Alarm Clocks and Good Sleep Don’t MixSleep occurs in stages that repeat throughout each night. This repetition is called the sleep cycle. Read our article on The Stages of Sleep and Sleep Cycles. Every cycle includes four stages:
- Stage One Stage One is the lightest stages. Your body relaxes, your mind drifts, and you may not even realize you are asleep. During this stage, you can wake easily.
- Stage Two Stage Two sleep is similar to Stage One but deeper. Your brain begins to actively block out external noises and disruptions and waking is more difficult.
- Stage Three During Stage Three you are in a deep and dreamless state. Waking is very difficult. Night terrors and sleepwalking can happen during Stage Three.
- REM Sleep REM is when dreams occur. Your mind reviews and interprets events of the day using the language of dreams. REM stands for Rapid Eye Movement. During REM your eyes move behind your closed eyelids as if you were awake and experiencing real events, but your body remains immobile so you don’t hurt yourself.