What keeps me up at night?

Deadlines, unfinished work, and a growing To - Do List.
I should manage that better by assigning out work and collecting the deliverables. Still, Sometimes what happens is that the people you need are not there, und they don't-get back to you. So what do you do? You follow up, of course!
It Sounds easy, but what if The person you sent out stuff to is still not available. Hmmm. l do have a problem then.