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English[en]
In fact, the stages alternate between of episodes of light sleep, phases of heavy sleep lasting about 20 minutes, followed by periods of REM (rapid eye movement) sleep, which lasts around five minutes.
Finnish[fi]
Uni vaihtuu ensin kevyestä unesta noin kahdenkymmenen minuutin jaksoon syvempää unta, ja siitä viiden minuutin jaksoon REM (Rapid Eye Movement) -unta.

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