Emotions can affect muscles, too. If you really become engrossed with the message at church, or even with the social aspects (seeing friends, keeping kids in line during service, etc), it can wear you out. My daughter is an athlete and I used to go into her competitions feeling peachy but just seeing her perform would turn me into mush---instant DV, no voice, unable to eat the rest of the day. Since the reboot I feel tired, but everything remains "intact." Parties, funerals, etc had the same effect.