Don't have as may breaks and get twitchy (8)
I believe the answer is:
restless
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for restless that I've seen before include "Unable to settle" , "Uneasy and agitated" , "Fidgety - unable to sleep" , "Always on the move" , "Constantly moving about or fidgeting" .)