Alain,

Since the unaan rejuvenation can be done in short segments, I wonder what your viewpoint is on doing it in public places, as waiting on line at the post office, or riding a bus, etc. This would be situations where there would possibly be noise as well as lots of people distracted with other activities.

As long as you have started the process properly and can continue to sweep and breathe saying U-NAN to yourself without losing this rhythm, it should be fine. The key would to not get distracted and thus lose the rhythm.