PT - JOURNAL ARTICLE AU - Parkes, JD TI - Sleep 1980 AID - 10.1136/jnnp.45.5.479 DP - 1982 May 01 TA - Journal of Neurology, Neurosurgery & Psychiatry PG - 479--479 VI - 45 IP - 5 4099 - http://jnnp.bmj.com/content/45/5/479.1.short 4100 - http://jnnp.bmj.com/content/45/5/479.1.full SO - J Neurol Neurosurg Psychiatry1982 May 01; 45