“…Behavioral observations to examine S/W are not unique to this study. A large number of pharmacological trials of hypnotic medications in elderly people have used nursing observations of sleep as at least one dependent variable (e.g., Dehlin, Falkheden, Gatzinska, & Nordqvist, 1978; Exton-Smith, Hodkinson, & Cromie, 1963; Linnoila, Viukari, Numminen, & Auvinen, 1980; Pathy, Bayer, & Stoker, 1986; Pattison & Allen, 1972; Stotsky, Cole, Tang, & Gahm, 1971; Viukari, Linnoila, & Aalto, 1978; Viukari & Miettinen, 1984). S/W has also been observed behaviorally in studies of infants (Anders & Keener, 1985; Prechtl, 1974; Thoman, Korner, & Kraemer, 1976), mentally retarded institutionalized children (Landesman-Dwyer, 1976), hospitalized children admitted for elective surgery (Hagemann, 1981), hospitalized psychiatric patients (Kupfer, Detre, & Harrow, 1967; Kupfer, Harrow, & Detre, 1969; Kupfer, Wyatt, & Snyder, 1970; Samuel, 1964), intensive care patients (Aurell & Elmqvist, 1985), and even other mammalian species (Bergmann, Rosenberg, Eastman, & Rechtschaffen, 1981; Bergmann, Winter, Rosenberg, & Rechtschaffen, 1987; Dallaire, 1986; Riss & Goodall, 1976).…”