2003): 575-90. 28 J. F. Brosschot, E. Van Dijk, andlErhayer,"Daily Worry is Related to Low Heart Rate Variability During Waking and the Subsequent Nocturnal Sleep Periar International Journal of Psychophysiology 63 (2007): 39-47. 29 A. J. Camm, M. Malik, J. T. Bigger, G. Breithardt, S. Cerutti, R. J. Cohen, P. Coumel, E .L. Fallen, H. L. Kennedy, Kleiger, F.