variations of this question would be how to stop procrastination, how to be disciplined, how to be productive...
Some days it's better, but those are when my sleep goes REALLY well... but that's like having motivation, not everyday is gonna be a perfect day, it'd be really advantageous to be able to maintain a good amount of momentum consistently.
No one is motivated to do stuff 100% of the time. Do you think superstar athletes like getting in the weight room and doing cardio everyday?
I think a lot of the problem is that modern life allows people to have this attitude when it wasn't an option in the past. No one used to care about whether they wanted to do stuff because if they didn't they would die.
"Oh I don't feel like getting firewood or hunting today" - Dead Caveman