explain

Drag the words into the correct boxes Disordered sleep is one of the most prominent symptoms of . There appears to be slow wave sleep and stage one sleep, as well as REM sleep occurring in the night. However, it is also interesting that can produce antidepressant effects (though only some people respond to the treatment). occurs when people experience depression during the winter season, when the days are short and the nights long. SAD involves lethargy and sleep disturbances, but also a craving for carbohydrates and weight . SAD can be treated by - where people are exposed to bright light for several hours a day. The light acts asa and synchronizes the biological clock to the dayight cycle. depression increased sleep deprivation earlier zeitgeber reduced gain Seasonal affective disorder phototherapy