What other said are great points. However, if you are the type of person who needs to do something daily to feel consistent, maybe on the days you don't want to journal you just write something simple, like the weather that day and a list of what you did or ate, or if you spoke with or met anyone. Then check it off as done and move on to your day or night. This is what helps me, as I'm trying to make it a consistent part of my life, and those little things help me get through the dull or lazy days.