feeling annoyed, lost, void or "without a scope" is the best thing can happen to you if you are able to manage it. 
Facing this low-noise / low-fun states you can really understand and act on a profound level of cosciusness. 
Dont distract with meaningless habits, embrace whats happening, embrace meaning in life.
So good for the spirit, and by a purely pragmatic perspective, so good for "being productive" in the long run.