Paul,
I thank you have a good handle on it. As for other reasons, I'm not sure of the frequency rating, but I notice, not prepared, distracted, illness, tiredness, worry and stress, and familiy and/or financial worries are strong distractors to overcome. We can be a shelter from these woes (at least while in school) if we can keep them engaged in some of the ways you describe.
Barry Westling
