every night

every night , before going to my bed , i always think and plan using my brain , because when i am in my bed , i'm comfortable , all thoughts came to my head , i think about my studies , my future , my mistakes of the day , all i thinknow at the first , is my college studies , i want to study hard to get high grades and finish quickly as possible as i can . if i arranged every thing properly and  i don't face  any problems , i sleep without worrying about any thing , otherwise i cant sleep :)