“…129-130). Findings suggest that panic attacks may occur in the absence of catastrophic thoughts as well; for example, a number of investigators found that panic attacks occur during the non-dreaming stages of sleep, where catastrophic thoughts are absent (Craske & Barlow, 1989;Craske & Rowe, 1997;Hauri, Friedman, & Ravaris, 1989;Lesser, Poland, Holcant, & Rose, 1985;Ley, 1988;Mellman & Uhde, 1989). Although Schredl, Kronenberg, Nonnell and Heuser (2001) reported that nocturnal panic attacks are closely related to dreams and nightmares, they too reported that a subgroup of patients in their study experienced panic attacks in the absence of dreams.…”