Stage 2 usually follow Stage 1 and represents deeper sleep. There is muscle tone present in the skeletal muscles. The EEG brain frequency is slightly slower than during wake time. Stage 1 of the sleep cycle is the lightest stage of sleep. Generally, brainwave frequencies and amplitudes from an electroencephelogram (EEG) are used to differentiate the different stages of sleep, along with other biologic rhythms including eye movements (EOG) and muscle movements (EMG). Stage 1,2,3, and 4, are categorized as вЂnon-REM sleepвЂ™, and the fifth stage, is REM sleep. Scientists categorized the stages of sleep based on the characteristics of the brain and body during sleep. There are five stages of sleep during the sleep cycle. BOARD MEMBERS / CONTRIBUTORS / REVIEWERS.Ask the Sleep Doctor: Do you have a question about sleep or sleep disorders?.Sleep Disorders вЂ“ ICD-10 Codes and Names.Sleeping Pills: Medications to Help you Sleep.Best Anti-Snoring Mouth Guards, Mouthpieces, and Snoring Devices.CPAP Supplies вЂ“ What connects to the CPAP machine?.CPAP and BiPAP: Which One is Best For You?.

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