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.
Humans average about four or five complete sleep cycles each night, each one lasting about 90 minutes. Dogs, on the other hand, may go through as many as 20 or more complete cycles, each one lasting just 15 minutes or so. Wakefulness between cycles is common in both species.