is it okay to let your mind wander ?
or do you need to really focus on the sound ?
or do you have to try to focus on nothing - not even the sound - and think about nothing ?
Ritalin !! This really is a must-have !!! I can't believe nobody thought of this yet... :D It's the stuff they give to what people used to call 'hyperactive' kids - nowadays often diagnosed as suffering from ADHD - to help them concentrate and not be over-sensitive to external stimulae, like sounds...