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Events in daytime are generally likely to be ignored.
is not likely to play any significant role
Increased venous return at night could be contributing.
So are dreams, nightmares
and so on, causing sympathetic stimulation...
, especially to the face, stimulates the Vagus nerve
– this can slow down the rate. Hence the help of the shower.
The third ablation (pulmonary veins isolation?) hopefully gives a permanent cure.
Wishing speedy recovery