I studied a lot of Korean today.. and none whatsoever for my Spanish oral tomorrow

오늘 나는 노트를 작성...나 피곤해요 ._. (you can omit '나는' because it's already assumed that you are the one who constructed the note.) 작성 + 하다 to make it an action verb, 그래서 "오늘은 노트를 작성해요")

난 피곤해요

안녕히 주무세요 ^_^