That "mommy hearing" is a selective hearing; for example, a mother may sleep through a thunderstorm but will wake up at the tiniest sound her baby makes. It is probably something which is 'programmed' by nature into mothers.
And like JonBenet's grandmother Nedra said, JonBenet would have screamed like hell had anyone tried to abduct her. She was not a shy child who would have kept quiet in fright.
Stun gun experts said JB would have screamed had a stun gun been used on her, and this has just been confirmed by posters here who have experience with stun guns.
The Ramseys did drink wine at the Whites' party, but I don't believe that was the reason why they did not hear anything at night because they slept like rocks afterward. But I do think the alcohol Patsy had at the party also contributed to her losing her temper with JB. Alcohol plays a huge role in many domestic violence cases, often driving people to do things which they never would have done when sober.
Not only did the Ramseys hear nothing at night, the intruder even had the nerve to feed JB pineapple and wait for an hour afterward, obviously without any fear of being detected.