1. American Psychiatric Association (1987) Diagnostic and statistical manual of mental disorders, 3rd edn, revised. APA, Washington DC
2. American Sleep Disorders Association (ASDA) (1990) The international classification of sleep disorders: diagnostic and coding manual. Allen Press, Lawrence
3. Berman TM, Nino-Murcia G, Roehrs T (1990) Sleep disorders. Take them seriously. Patient Care 23: 85–113
4. Bixler EO, Kales A, Soldatos C, Kales J, Healey S (1979a) Prevalence of sleep disorders in the Los Angeles Metropolitan Area. J Psychiatry 36: 1257–1262
5. Bixler EO, Scharf MB, Soldatos CR (1979b) Effects of hypnotic drugs on memory. Life Sci 25: 1379–1388