State organization involves being able to transition in and out of different stages of sleep smoothly and into alterness (but not crying, which is the highest behavior state). Premtature infants have a very difficult time transitioning from one stage of sleep to another and do not spend enough time in quiet sleep stages. Queit sleep helps to protect the infants from environmental stimuli and fosters motor organization. Quiet sleep is also characterised by regular breathing patterns, so it leads to a decrease in apnea (kangaroo and sleep). Crying is very bad for infants because it decreases lung capacity, increases intracranial pressure, reestablishes some fetal circulatory patterns (book) and starts stress reactions within the body. Kangaroo care prevents crying, or at least severly limits crying in infants (book too). In addition, it reduces active sleep and significantly increases quiet sleep.