This transcript discusses the stages of non-REM sleep and the changes that occur in the body during each of the stages.
In the first half of the night, the majority of the time spent sleeping consists of deep non-REM sleep. However, in the second half of the night, there is more rapid eye movement sleep and stage two non-REM sleep. Lack of sleep and long shifts have been linked to medical errors in the emergency room and decreased productivity in the workplace.