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Should I inhale when the halo of light expands or when
it shrinks? You should inhale when the halo expands and
exhale when it retracts.
The exhalation seems longer than the inhalation, is
this normal? Yes, the exhalation is deliberately longer.
Indeed, with slow breathing, and when the exhalation is
longer than the inhalation, more CO is released. When
the CO concentration in the blood decreases, so does
the size of the cerebral vessels. This phenomenon, called
vasoconstriction, creates a sensation of tiredness which
is conducive to falling asleep.
Where should I focus my atention? Part of your atention
will automatically be focused on the light and the pace
you will be following. You should focus the rest of your at-
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