Because of the chemical nature of impulse and the axon-dendrite structure. Because of the chemical nature of impulse and the axon-dendrite structure. http://www.biologymad.com/nervoussystem/nerveimpulses.htm (Best technical explanation and excellent graphics and animations)
Newborns may sneeze, and this is typically attributed to the irritation of their nasal passages. The most common irritants, explains Dr. Iannelli, are smoke (and simply smoking outside is not enough), animal dander from pets in the house, dust mites, and mold.
1 It has to do with sneezing being a reflex action. 2  When you're sleeping, the nerves involved in sneezing are relaxed, breaking the chain reaction of the typical sneeze. 3  If someone were to wave irritants under your nose while you were sleeping, however, you might wake up and sneeze.ometimes that takes two, three, or four sneezes. 1  Why Sneezing and Snoozing Don't Mix You may snore, but you don't sneeze when you sleep. 2  It has to do with sneezing being a reflex action. 3  When you're sleeping, the nerves involved in sneezing are relaxed, breaking the chain reaction of the typical sneeze.