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How much deep (stage 3 and 4) sleep do we need?
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How much deep (stage 3 and 4) sleep do we need?

Last week was sleep week.  I was watching Rachel Ray and they had a sleep doctor and a patient. The patient complained about poor, fragmented sleep, lack of concentration,  and always tired.

A PSG (overnight sleep study) was done and while the patient did not have sleep apnea, the doctor said his levels of deep sleep were comparable to a 70 year old man.

So, what does that actually mean? Stage 3 and 4 is the deep sleep where we feel rejuvenated and our bodies rest.  How much Stage 3 and 4 sleep do we need? What are the specific levels required, say, in percentage terms of sleep? What if you have more Stage 3 sleep and no Stage 4?
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