When I try to sleep at night,I suddenly feel kind of "manic" and have to get up again-why?

You not not say how old you are or why you find yourself unemployed. If you are not disabled and of an age when you should be working then you do have a job and that is finding a job. No excuses; your brain is not shutting down at night because you have unfinished business which is not satisfied at the end of your day. Work is a good thing so while you are walking make sure you are actively seeking employment.