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During the night, you cycle through five separate stages of sleep every 90 to 110 minutes, experiencing between three and five dream periods each night. The five stages of sleep can be distinguished by changes in the electrical activity in your brain, measured by electroencephalogram (EEG).
Justin Lowery, RN, Software Designer, Interaction Dev. Views. Nothing worth discussing happens to your body during REM. The only interesting thing is sleep-paralysis (technically, it means your muscles become flaccid and non-responsive), but that's not due to any changes to your body, but changes to your brain chemistry. This sleep paralysis is so you don't flail around acting out your dreams while sleeping.