I want to know the answer to the following question:
What does the body interpret from the gene feedback loop?
All the background I'm provided with is that "A defect in the human homologue of the Drosophila "period" gene was identified as a cause of the sleep disorder FASPS (Familial advanced sleep phase syndrome), underscoring the conserved nature of the molecular circadian clock through evolution.". Is that enough to answer the question?
Answer: no