When you find the mind agitated and there are more distractions, ask yourself: Is the breath longer or shorter, deeper or shallower, finer or coarser than when the mind is calm? What about the length or depth of the breath during a spell of drowsiness? Do states of agitation, distraction, concentration, and dullness affect the out-breath more or in a different way than they do the in-breath? Do they affect the pause before the in-breath more or less than they affect the pause before the out-breath?
