| http://www.w3.org/ns/prov#value | - day ??? In particular visual stimulation from different surroundingsAge ??? Older people tend to experience less deep sleep than younger peopleMany different drugs and substances such as alcohol can also prevent us from entering the deeper stages of sleep at night.NREM Stage 4?Stage 3 (deep sleep) was originally split into two separate stages known as stage 3 and stage 4.
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