Effects of REM sleep awakenings and related wakening paradigms on the ultradian sleep cycle and the symptoms in depression

• Published in: Journal of psychiatric research 2002-09, Vol.36 (5), p.299-308
• Main Authors: Grözinger, Michael, Kögel, Pia, Röschke, Joachim
• Format: Article
• Language: English
• Subjects: Adult; Antidepressive Agents, Tricyclic - therapeutic use; Biological and medical sciences; Brief awakenings; Circadian Rhythm - physiology; Depression; Depression - diagnosis; Depression - drug therapy; Depression - psychology; Female; Hamilton depression scale; Humans; Male; Medical sciences; Miscellaneous; Psychology. Psychoanalysis. Psychiatry; Psychopathology. Psychiatry; REM pressure; REM sleep; Severity of Illness Index; Sleep deprivation; Sleep Disorders, Circadian Rhythm - diagnosis; Sleep Disorders, Circadian Rhythm - epidemiology; Sleep Disorders, Circadian Rhythm - etiology; Sleep, REM - physiology; Surveys and Questionnaires; Treatments; Trimipramine - therapeutic use; Wakefulness
• ISSN: 0022-3956; 1879-1379
• DOI: 10.1016/S0022-3956(02)00022-5

In 1975 Vogel and coworkers published their classical study where they compared selective rapid eye movement (REM) sleep deprivation by brief awakenings to a control intervention paradigm in depressed patients. The superior antidepressive impact of the first procedure was attributed to the REM pressure accumulating during the treatment period. The laborious procedure and the considerable effort necessary to evaluate the sleep profiles in real time have prevented similar experiments so far. Based on artificial neural networks we developed a software for the real time detection of REM sleep. In combination with an alarm system the algorithm allowed us to wake up subjects automatically and to reduce REM sleep by about 50%. The procedure was then compared to a modified nonREM intervention paradigm for a treatment period of ten consecutive nights in depressed patients ( n 1=14, n 2=13). These simultaneously received moderate dosages of Trimipramine. We found a strong and robust but not significantly different reduction of the average Hamilton rating scores (33 and 41% of baseline levels). While the REM sleep awakenings shortened the sleep cycle duration considerably, our nonREM intervention paradigm lengthened the ultradian alternations. Both effects might be interpreted as a challenge imposed on the nonREM–REM alternating mechanism possibly responsible for the antidepressive impact. A different timing of the control interventions might have caused the discrepancy between our findings and those of Vogel and coworkers.