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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).
And sleep apnea, where a person stops breathing intermittently throughout the night causing disrupted sleep, can also trigger you to wake up. With sleep apnea, you might not notice it unless you have a bed partner saying you're having pauses in breathing during sleep, he says.