A healthy bladder empties itself four to eight times per day. This number increases as one ages, as the bladders of older people often begin contracting more often. Urinating every three to four hours is average, although this depends on how many liquids one has taken in on a given day. Most people do not feel the urge to urinate at night even if their bladder is full, as the bladder often "goes to sleep" when they do.

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