Hello,
This wetting of bed is called adult urinary
incontinence. It can be due to overtaking the fluids at night, urge
incontinence, inappropriate bladder contractions, constipation, infection ,a stone in the bladder, post menopause( due to thinning of tissue due to decreased estrogen) and use of diuretics ("water pills").If it is the first episode of bed wetting then you should go to bed without a full bladder. But if the repeat happens, then please get it evaluated from a urologist.