October 24, 2013 by Susan Crum, Ph.D., A.B.P.S. Is it mental illness, cognitive decline, or sleep deprivation? October 24, 2013 04:55 by Susan Crum, Ph.D., A.B.P.S. [About the Author] Mental Illness, Cognitive Decline, or Sleep Deprivation? How to tell the difference, and why it is important. [More]