title: Fatigue or daytime sleepiness?
authors: Sleep Research & Treatment Center, Department of Psychiatry, Penn State College of Medicine, Hershey, PA 17033, USA. rsingareddy@hmc.psu.edu
authors: Ravi
authors: R
authors: Singareddy
authors: Edward O
authors: EO
authors: Bixler
authors: Alexandros N
authors: AN
authors: Vgontzas
mesh_terms: D002908:Chronic Disease; D003937:Diagnosis, Differential; D006970:Disorders of Excessive Somnolence / Q000175:diagnosis* / Q000523:psychology; D005221:Fatigue / Q000175:diagnosis* / Q000523:psychology; D006801:Humans; D012892:Sleep Deprivation / Q000175:diagnosis / Q000523:psychology; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis* / Q000523:psychology; D012893:Sleep Wake Disorders / Q000175:diagnosis / Q000523:psychology