I don't usually have to fight laziness. I usually just have to fight a sense of futility, hopelessness, or pointlessness, or maybe even
learned helplessness - things which are easily mistaken for laziness, especially if I'm in a self-condemning mood.
Or sometimes, sleep deprivation - that makes it hard for me to do anything, even things I really enjoy. The only way for me to win _that_ battle is for me to just succumb to sleep.
If I feel unable to do something, it's usually because of an underlying feeling that it's not going to do any good in the future, or it will take too long, or is literally beyond my capabilities, or, even if it's a productive activity, it doesn't seem like the best possible thing I could do, or it's distracting me from the main thing I should focus all my energy on which is most likely to improve my life. Or, possibly I've been slave-driving myself too long and hard and haven't permitted myself enough leisure.
Sometimes just getting some sleep is enough lift my negative moods. Paying attention to my diet and not neglecting to eat enough nutritious food also helps. And just overall avoiding being too hard on myself. Feeling guilty about being "lazy"/not doing enough does nothing but make me even less motivated/effective.
Best wishes,
Apollia