Our expert says:
The formation of an erection is mainly due to adrenaline that rushes blood to the penis filling the penis to the point of an erection. Excitement, a freight, shock, fear of embarrassment are all reactions where adrenaline play a role. It is possible that the momentum of waking up in a public place - meeting or church where it is not "appropriate" to sleep could rush a fee long of "excitement / worry / fear" through the body and resulting your body / penis to erect.
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