I suppose it's cheating to make two posts in a row about someone else's post, but I can't pass up this great Conversion Diary guest post by Simcha Fisher. Her analogy between childbirth and the Child-birth (Christmas) is an imaginative tour de force worthy of Ray Bradbury. (If her writing is less brilliant and esoteric than Bradbury's, it is still excellent, and definitely more uplifting.)
It would be stretching "fair use" too far to quote as much as I'd need to to make her point. Go to the original and follow her from Advent (third trimester) through Christmas (birth, and the first few weeks after) and Epiphany (the light at the end of the tunnel) to Ordinary Time (the return to normal life, with a big difference). Enjoy!