I stayed in my parents basement during high school and again for some time after college graduation. I've found it okay. It takes some getting used to, and you

I stayed in my parents basement during high school and again for some time after college graduation. I've found it okay. It takes some getting used to, and you need to make an effort to go outside periodically and get some sunshine, but I've found staying in the basement gives me a better sense of privacy and control (my parents were less concerned with what I might rearrange in the basement hallways than say the upstairs hallways). Still, sunshine is a good idea generally for both physical and mental health, and its easy to slip out of a reasonable sleep cycle when staying in the basement away from the rhythms of the sun. So your mileage may vary.