my brain is dead

I can't seem to get my brain going this semester. I was going to read a chapter in one of my textbooks but before I got past the second page, I had fallen asleep. I physically could not keep my eyes open. I also am at a loss for lessons. The creative juices just don't seem to be flowing. I can't seem to concentrate on school tasks long enough to get them done. I seem to be satisfied with doing nothing. I can't even motivate myself to do something fun that requires attention, such as sewing. Hopefully this will pass before too much longer because it could start to affect my schoolwork. I can't even think enough to write much more. Oh well.