Has anyone looked into whether doing nothing at all -- so just sitting or lying down until you can work -- raises motivation in those affected by a clinically significant lack of motivation
Is that too much like self help to ask?
The question may or may not be seen as a self help question but either way there is ironically, a distinct lack of motivation in the question.
A question with the required level of motivation will have been researched by reading books on the subject or web searching prior to asking.
As you may know seeing as you have a fair amount of reputation on this site, for this reason among others, we work differently to many SE sites, where we have a strict policy that all questions should show evidence of prior research.
If there were references to books and/or websites on the subject along with anything you don't understand etc. the question could stand on its merits as a question arising out of interest in gaining more knowledge on the subject.