Final answer:
Rachel is most likely trying to treat Seasonal Affective Disorder (SAD) through phototherapy, which involves exposure to bright light. This can help realign the biological clock and alleviate symptoms of insomnia, anxiety, and depression.
Step-by-step explanation:
Rachel is most likely trying to treat Seasonal Affective Disorder (SAD) through phototherapy.
SAD is a mood disorder that occurs most commonly during the winter months, especially in regions with long winter nights. It is characterized by increased appetite, sluggishness, increased sleepiness, lack of energy, and difficulty concentrating on tasks.
Phototherapy involves exposure to bright light, which can help realign the biological clock and alleviate symptoms of insomnia, anxiety, and depression.