Sleep disturbances in fibromyalgia syndrome: the role of clinical and polysomnographic variables explaining poor sleep quality in patients

Highlights • Sleep disturbances are frequent and highly debilitating in fibromyalgia syndrome. • Patients with fibromyalgia differ in sleep structure from healthy controls. • Patients with fibromyalgia sleep lightly, less efficiently, and spend more time awake. • Wakefulness time is the best determinant of sleep complaints in fibromyalgia. • Depression and antidepressants also explain sleep complaints in fibromyalgia.