For me that restlessness is always due to an event that has tested my values or something I did not handle well. Either of the above forces me to evaluate my behaviour and what I could do differently. When you are sure of your values the reason becomes clear. I have always treated others the way I would like to be myself, no matter how difficult the circumstance are, when I compromise this value, my sleep is disturbed as I think over what I did and reflect on what I should have done, what I do to fix.
Do you sleep well?