Answer:
Circadian rhythm sleep disorder ( CRSD )
Step-by-step explanation:
The melatonin is secreted from pineal gland. The melotonin concentration increases during low light ( dim light ). The excess in level of secretion of melatonin can cause sleep disorders. This can be controlled by providing bright light as melatonin is synthesized more during dim light.
Circadian rhythm sleep disorder is treated with light therapy to decrease the production of melatonin.