Posted in Web Chronic fatigue syndrome – Diagnosis and treatment – Mayo … January 14, 2021 Chronic fatigue can be caused by sleep disorders. A sleep study can determine if your rest is being disturbed by disorders such as obstructive sleep apnea, restless legs syndrome or insomnia. https://www.mayoclinic.org/diseases-conditions/chronic-fatigue-syndrome/diagnosis-treatment/drc-20360510