I think it's normal. It's because you've been working hard on the day, so at home you want entertainment or rest. I like that too after I'm home from work. Very tired and wish to do nothing but watching cartoon or surfing on my bed.

I still able to force myself doing some task, if I'm not too tired. I think it is because of habit too. I see that you just enter college (1 month, right?), so it's normal to feel that way. You have not adjusted yet to your new lifestyle. Give yourself some time to adapt.