[Shank]

This is actually a primary motivator behind how GTD works. Offload things you'll forget to a system you trust. Prioritize based on importance, completion time, complexity, and when and where you can do the work. If something requires your utmost attention and focus, you probably can't do it an hour before bedtime. You also can't do it in the middle of the freeway.

If you just have a todo list, though, you run the risk of stressing yourself out about the items on the list. And that's kinda defeating the point.