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Stage 1 sleep allows easy awakening, while deep sleep in Stage 3 and Stage 4 poses difficulty waking individuals.
Stage 1 sleep is associated with alpha and theta waves, making it relatively easy to wake someone. Light sleep in this stage means individuals are easily awakened and may even report not having been asleep if awakened during this stage. On the other hand, Stage 3 and Stage 4 are characterized by delta waves, resulting in deep sleep where it is much more difficult to awaken someone.
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