The different brain waves associated with the five stages of sleep can be recorded by this imaging technique

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EEG (electroencephalogram) is the imaging technique that detects and records the electrical activity of the brain and can identify the different brain waves associated with the five stages of sleep. fMRI (functional magnetic resonance imaging) and MRI (magnetic resonance imaging) do not measure brain wave activity, and PET (positron emission tomography) measures the metabolic activity of the brain, but not specifically related to sleep stages.

The Different Brain Waves Associated with the Five Stages of Sleep