I want to have a routine life habit: having lunch at lunchtime, having dinner at dinnertime, going to sleep at 10pm, etc. After all, a healthy brain is in a health body. Moreover, while I can prioritize my thinking flow over my hunger, other people that I care can't. One or two days breaking the routine is fine, as long as the "breaking the routine" doesn't become a routine.
However, this life habit seems unachievable to me, since my brain usually isn't tired when my body is. In uncountable occasions, I can literally stop caring the outside world to focus thinking about my problem. It's not what I want, but when the idea comes it's really frustrating for me to not thinking about it. I have the idea for this question when I was brushing my teeth before going to sleep, and after a consideration I decide to open the laptop to write it down, despite knowing it will take me an hour to think about it carefully.
I have tried many things to maintain the habit: taking notes, using calendar, using task manager. Sometimes the habit slowly starts, but is doesn't last for one month. I'm not feeling guilty about unfinished work, I'm feeling guilty about losing ideas if I don't note all of them down immediately. Noting briefly is only good for simple keywords to research later, not when you have a flood of idea.
So, is there any way to maintain a routine life habit?