P. Ruyak

The effects of exercise as a countermeasure for fatigue in sleep-deprived aviators.

J A Caldwell, J. Caldwell, B. Prazinko, 2000, Military psychology : the official journal of the Division of Military Psychology, American Psychological Association.

Recovery of Sleep, Performance, and Mood Following 38 Hours of Sleep Deprivation Using Naps as a Countermeasure

J. Caldwell, J. Caldwell, P. Ruyak, 1998 .

The Effects of Exercise as a Countermeasure for Fatigue in Sleep-Deprived Aviators

Patricia A. LeDuc, John A. Caldwell, J. Caldwell, 2000 .

Working Through the Pain: A Controlled Study of the Impact of Persistent Pain on Performing a Computer Task

K. Harman, Katherine Harman, Peggy Ruyak, 2005, The Clinical journal of pain.

The effects of exercise versus napping on alertness and mood in sleep-deprived aviators

J. A. Caldwell, J. Caldwell, P. LeDuc, 1999 .

A Survey of Insomnia Treatment at Canadian Sleep Centres: Is There a Role for Clinical Psychologists?*

P. Ruyak, C. Bilsbury, M. Rajda, 2004 .

Predicting the Ability to Maintain Alertness During Sleep Deprivation: The Accuracy of Subjective Evaluations

J. Caldwell, P. Ruyak, 1997 .