A 2004 study also found medical residents with less than four hours of sleep a night made more than twice as many errors as residents who slept for more than seven hours a night, an especially alarming trend given that less than 11% of surveyed residents were sleeping more than seven hours a night.
Best Answer: A normal adult bladder can hold anywhere from 16 to 24 ounces (about 500 to 750 mL) before the urge to urinate becomes overwhelming. Everyone's bladder is different though, so some can hold more than that amount, some less.
The three main causes of urinary retention in women are a hypotonic bladder, dysfunctional voiding, and vaginal prolapse. A hypotonic bladder muscle, also called a lazy or neurogenic bladder, does not contract (squeeze) hard enough during urination to empty the bladder completely. Dysfunctional voiding is a condition in which the muscles around the urethra do not relax enough during urination to allow urine to pass freely.