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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).
What is sleep apnea? If you have sleep apnea, youâll breathe normally during the day. Itâs only at night, when you fall asleep, that your breathing stopsâsometimes for 10 seconds, sometimes for a minute or more. You may snore loudly or even struggle for air when the level of oxygen in your blood starts to fall.