I'm tired all of the time again and I can't tell if I'm depressed or just need a med adjustment.

I have stuff in my life I probably could be depressed about, but I'm kind of not. But holy hell, left to my own devices I could easily sleep in until 3:00pm. In fact, that's what I have done the last two Sundays. It's not like I do anything stimulating, I water my plants and generally just hang out. My next endocrinologist appointment isn't for another couple of weeks, but I'm very confused as to why I can barely keep my eyes open. I'm so tired, I want to ask my boss if I can leave early just to sleep :(