RT Journal Article SR Electronic T1 Sleep and its Disorders JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 1335 OP 1335 DO 10.1136/jnnp.49.11.1335-a VO 49 IS 11 A1 Ja Simpson YR 1986 UL http://jnnp.bmj.com/content/49/11/1335.2.abstract AB