Baekeland, F., and Hartmann, E. (1971). Reported sleep characteristics: effects of age, sleep length and psychiatric impairment. Comprehensive Psychiatry, 12, 141–147.
Cooley, W. W., and Lohnes, P. R. (1962). Multivariate Procedures for the Behavioral Sciences. Wiley: New York.
Detrc, T. (1966). Sleep disorder and psychosis. Canadian Psychiatric Association Journal, 11, Suppl., S169–S177.
Feinberg, I., and Carlson, V. R. (1968). Sleep variables as a function of age in man. Archives of General Psychiatry, 18, 239–250.
Goodyear, M. D. E., Johns, M. W., and Masterton, J. P. (1971). Unpublished data.
Goodyear, M. D. E. (1973). Stress, adrenocortical activity and sleep habits. Ergonomics, 16, 679–681.
Harman, H. H. (1967). Modern Factor Analysis. 2nd edn.University of Chicago Press: Chicago.
Hartmann, E., Baekeland, F., and Zwilling, G. R. (1972). Psychological differences between long and short sleepers. Archives of General Psychiatry, 26, 463–468.
Hawkins, D. R., and Mendels, J. (1966). Sleep disturbance in depressive syndromes. American Journal of Psychiatry, 123, 682–690.
Hersen, M. (1971). Personality characteristics of nightmare sufferers. Journal of Nervous and Mental Disease, 153, 27–31.
Johns, M. W., Egan, P., Gay, T. J. A., and Masterton, J. P. (1970). Sleep habits and symptoms in male medical and surgical patients. British Medical Journal, 2, 509–512.
Johns, M. W. (1971). Methods for assessing human sleep. Archives of Internal Medicine, 127, 484–492.
Johns, M. W., Gay, T. J. A., Goodyear, M. D. E., and Masterton, J. P. (1971a). Sleep habits of healthy young adults: use of a sleep questionnaire. British Journal of preventive and Social Medicine, 25, 236–241.
Johns, M. W., Gay, T. J. A., Masterton, J. P., and Bruce, D. W. (1971b). Relationship between sleep habits, adrenocortical activity and personality. Psychosomatic Medicine, 33, 499–508.
Johns, M. W., Hepburn, M., and Goodyear, M. D. E. (1971c). Use of hypnotic drugs by hospital patients. Medical Journal of Australia, 2, 1323–1327.
Johns, M. W., Bruce, D. W., and Masterton, J. P. (1974). Psychological correlates of sleep habits reported by healthy young adults. British Journal of Medical Psychology, 47, 181–187.
Jouvet, M. (1967). Neurophysiology of the states of sleep. Physiological Reviews, 47, 117–177.
Kaiser, H. F. (1960). The application of electronic computers to factor analysis. Educational and Psychological Measurement, 20, 141–151.
Kupfer, D. J., Wyatt, R. J., Scott, J., and Snyder, F. (1970). Sleep disturbance in acute schizophrenic patients. American Journal of Psychiatry, 126, 1213–1223.
Lewis, S. A. (1969). Subjective estimates of sleep: an EEG evaluation. British Journal of Psychology, 60, 203–208.
McGhie, A. (1966). The subjective assessment of sleep patterns in psychiatric illness. British Journal of Medical Psychology, 39, 221–230.
Monroe, L. J. (1967) Psychological and physiological differences between good and poor sleepers. Journal of Abnormal Psychology, 72, 255–264.
Östberg, O. (1973). Circadian rhythms of food intake and oral temperature in “morning”and “evening” groups of individuals. Ergonomics, 16, 203–209.
Rechtschaffen, A., and Monroe, L. J. (1969). Laboratory studies of insomnia. In Sleep: Physiology and Pathology, pp. 158–169. Edited by Kales, A.. Lippincott: Philadelphia.
Ward, J. A. (1968). Alterations of sleep pattern in psychiatric disorder. Canadian Psychiatric Association Journal, 13, 249–257.
Webb, W. B., and Friel, J. (1971). Sleep stage and personality characteristics of “natural” long and short sleepers. Science, 171, 587–588.
Weiss, H. R., Kasinoff, B. H., and Bailey, M. A. (1962). An exploration of reported sleep disturbance. Journal of Nervous and Mental Disease, 134, 528–534.