This stage forms 20-25% of our total sleep time and comes as the one where dreaming happens.ĭreams are vivid images and stories our brain creates while we sleep. Our limb muscles are paralyzed in this phase, while the heart rate and blood pressure go up. The eyes go in various directions, and our breathing becomes more irregular, shallow, and faster in general. Phase 5: This is the ‘rapid eye movement’ (REM) stage. This phase accounts for 12-15% of our sleep. Even if you manage to do it, the person will feel very disoriented for a couple of more minutes after waking up. It’s very hard to wake up a person when in these stages. In phases 3 and 4, we’re in a state called “deep sleep”. Phase 4: Our brain starts producing delta waves. Phase 3: Delta waves (very slow brain waves) appear, together with small, faster waves that intersperse them.
This phase makes 45-55% of our total sleep. Phase 2: Brain waves become slower and eye movements stop.
Phase 1: Muscle activity is reduced, eye movement slows, and sleep is light.
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