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Most people can get a normal sleep of 8 hours without the need for urinating in the night. Nocturia is the term given for frequent urination in the night. It is normal for a middle aged person to wake early in the morning for this.
Taking fluids like alcohol, coffee in the night before going to bed can increase the urinary output. These are normal happenings. Apart from the normal reasons the most common cause of it is a Urinary Tract infection. Other causes can include enlarged prostate gland, anxiety disorder, urinary incontinence, stroke and other nervous system disorder etc.
Frequent urination in women can occur during pregnancy stages which again can be considered as normal and not serious.
Usually these phases will pass as soon as your pregnancy period is over. But for cases of frequent urination in women, the reasons can be as serious as an ovarian cyst or cancer. If any women experience the associated symptoms of pain in the pelvis or a bloated abdomen it is an indication of something serious.
Consult your physician immediately. Vaginitis in women can also be cause for the problem. What causes this problem in men? Typical problem in men that cause this symptom, is enlargement of the prostate gland, which is situated near the bladder.
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From: (frequent urination in males) http://goarticles.com/article/Do-You-Know-About-Frequent-Urination-In-Men/5946931/