The signs of sensory deprivation include persistent jerking, shivering, and tremulous trunk and arm movements in bed for no apparent reason. Moaning, grunting, calling out "help", or "no" or swearing at odd hours for no apparent reason are verbal expressions of distressing sensory deprivation. When a word is used, it seems to be a semiconscious, automatic selection for a sign of distress. A loss of circadian rhythm is common. The signs of distress due to sensory deprivation are the same as the signs for pain, but without a cause for physical pain.