The fourth stage of sleep, deep sleep, which is necessary for muscles and other body tissues to regenerate, is deficient. The pattern of insomnia varies. Some may have trouble falling asleep, may wake up often during the night and be unable to fall back to sleep, toss, turn, and wake up earlier than is necessary. Fatigue, another symptom, may occur in the early afternoon or all day long preventing normal functioning. At the end of the day, a person may be completely exhausted and need a good night's sleep but because of sleep disturbances does not get that sleep.
Neurological symptoms occur in about one-fourth of persons with fibromyalgia.
Numbness and tingling in the arms and legs are common. No one knows why these sensations happen and no specific treatment exists. Forty percent of persons with fibromyalgia suffer from often severe tension headaches as well as migraines. Irritable bowel syndrome is another symptom that occurs in about 30 percent of fibromyalgia sufferers. IC is an inflammatory disorder affecting the bladder wall causing frequent urination, urgent urination, pelvic pain relieved by urination, burning on urination, and difficult urination.