Have my parents gone overboard?

they think that i they dont let their kids take naps in the afternoon, they will sleep better and longer at night. is this true or are they crazy? our naps are supposed to make up for our loss of sleep because of our history teacher whose overloading us with work because of the tests coming up. also, my grades have gotten into this; my computer too! my dad yells at my spanish grade which is a B+ and im like *#&@!(i dont use bad words, i just think it) he tells me that its because i sleep in the afternoon. its because of my constant playing on the computer. im on the computer doing my homework!. its because of his constant allegations. he accuses me of watching , playing games, and slacking off in school. this is the cause of the stress that is making me do bad in school, but he cant see that; hes stuck in his junior years where he excelled. that was vietnam. it was a long time ago.