If a person is awakened during stage 4 sleep, he or she will appear very groggy and confused.

Name: If a person is awakened during stage 4 sleep, he or she will appear very groggy and confused.
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During stage 4 sleep, also known as deep sleep or delta sleep, the brain produces slow delta waves, and waking someone up during this stage can result in disorientation and grogginess due to the depth of sleep.

If a Person Is Awakened During Stage 4 Sleep, He