Start your new approach to getting organized by keeping a small legal pad—5” x 7” is a handy size—and a pen or pencil next to the monitor. Head the top of the sheet with the next day, in other words, sitting by my monitor is a pad with the next day, for example, “Friday,” written at the top. When a task that needs to be done the next day occurs to you, jot it down.
The reason for using a pad and pen instead of some kind of electronic memo keeper is ease of access. Human behavior dictates that the more trouble to do something is, the less likely it will be done. Grabbing a pen or pencil to make a note is less trouble than stopping something productive you were doing in order to open some other program, enter the task, save it, close it, and get back to work.
Another reason for using a manual method is it is quite possible you will think of something else that should be done the next day after the computer is turned off. When you are ready to quit for the day, go through the list. Any tasks that are no longer required cross them off. Then number the remaining items in priority order, 1, 2, 3, and so forth.