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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).
Studies have shown that while we sleep, our brains process and consolidate our memories from the day. If you don't get enough sleep, it seems like those memories might not get stored correctly -- and can be lost. What's more, some research suggests that sleep decreases the chances of developing false memories.