Maybe put the journal someplace where it's easier to get to? Putting it where you could see it and easily access it might make you more motivated to use it. Many times, I lose motivation to write down dreams as well simply because getting up and turning on the light is a pain. Sometimes though, you just have to deal with it and tell yourself that if you write down your dreams you'll improve your recall.

To improve your recall, upon awakening, remember to lie still with your eyes closed for a few minutes and think about what you dreamed about. Usually you'll remember more stuff this way. Then be sure to write it down! As you continue to do this, your dream memory will improve and you'll have better recall. You've gotten to that point before so you could do it again.

To get back into the mood of LDing, turn sleeping into a game! Challenge yourself to see how many dreams you could remember and if you could get lucid. When you make it fun, you get motivated and stay motivated, especially when you experience success.