Why am I other tired?

I am 15 years old, and I am other tired. I used to love to read, and now I can by a hair`s breadth do that, I just don't enjoy the energy, I usually sleep 7-8 hours respectively night, but during the holidays, I slept up to 10 hours and be still tired. I was also wondering if it might enjoy to do with the weather? Should I be taking vitamin D during the winter because it is other rainy, snowy, and depressed where I live. shift to the doctor and get your thyroid checked, you could also hold a sleeping disorder. It is not depressin unless you are feeling saddened and depressed around things. Talk to your doctor or checkout the website below.
You might possbly have depression.