Symptoms of a urinary tract infection (UTI) may include: Pain or burning when you urinate. An urge to urinate frequently but usually passing only small amounts of urine. Pain in the lower belly.
For our purposes, it suffices to say that one sleep cycle lasts an average of 90 minutes: 65 minutes of normal, or non-REM (rapid eye movement), sleep; 20 minutes of REM sleep (in which we dream); and a final 5 minutes of non-REM sleep.
A complete cycle lasts around 90 to 110 minutes. So eight hours of sleep will give you around five of these sleep cycles per night. Notice how we are in NREM sleep for the most part. Initially, REM sleep only lasts for about 10 minutes at the end of the cycle. However, as the night goes on, some NREM cycles get shorter and REM sleep increases, which is why you dream most in the mornings.