I am a high school student who uses a MacBook to take notes. I recently had some troubles I store my laptop in a shock-resistant bag that I never throw around or anything that would harm my laptop My laptop sometimes is awake in something my friend said is called "clamshell mode" but I had never downloaded anything that would cause this. Strange thing is, if I close it, the sleep light turns on; the computer falls "asleep" and the light slowly fades in/out. After I walk to my next class, the apple light on the back of the screen is on, and when I open my laptop is on and is quite warm. This is a problem because not only can I not leave my laptop in the case for very long, but it will also wear down my battery if it keeps using up power while it's on. ( i know sleep mode also uses up power, just not as much) Could I get some help? Thanks.