Why do I take 5 hour long naps?

I (F23) usually get 7-9 hours of sleep a night. Lately, I’ve been laying down in the afternoon or evening for a little “20 minute cat nap” that turns into a 4-5 hour long nap. I eat well, exercise regularly, and don’t have any ailments. I have anxiety, but I’ve been medicated for 6+ years and doing well. I did start 3mg of my GLP1 this weekend so that may be a factor. Why are my naps so long? Why am I sleeping so much?