Gray zone is we deal or experience daily. Are you designing with your PC at the same time chatting on Discord server, if you have ever done this, then that’s Gray Zone? Doing two things at a time is referred to Gray Zone according to psychologists.
Gray zone limit our work rate. Work should be binary, either ON or OFF. A task has to be completely focused at 100%, this could lead us to a flow state.
Gray zone has become most of our habits, if you want to stop experiencing it, I will advise keeping the culprit locked in your cupboard if it’s you phone keep it off till you finish your task.