Merry Christmas to everyone here. Thank you all SO very much for your help and friendship during the year, and I look forward to working with all of you again next year!
Very cute - but the actual answer is that after a time of being "On" (attentive, personable, interactive) an introvert needs time alone and quiet to recover - quite possibly including a nap. It can be as exhausting as suddenly doubling or tripling your usual level of physical activity.