As per the question, the various periods of sleep from quiet sleep to actively moving about and crying would be called '<u>states</u>'. Psychologically, the sleep cycle consists of four to five distinct stages beginning from drowsiness in Rapid Eye Movement to deep non-Rapid Eye Movement sleep. Stage 2 involves the active sleep in which the child is witnessed actively moving and tweaking arms and legs while the 'quiet sleep' is demonstrated as the final stage 5 in which the infant's sleep becomes more sound and progressively deeper. Thus, these periods are characterized as 'states'.
