I’m Wiped Out!
I have not worked outside the home five days a week in about eight years now. I’m absolutely, positively worn out. Being a stay-at-home mom to an infant and toddler tired me out, as well – but it was a different sort of tired.
Either way, this is a new chapter of my life, much anticipated, much appreciated, and just a little bit fraught with the unknown. My daughter will be in before and after school programs for the first time in her life and we will both be waking up around 5 a.m. Of course, the early wake up time will be a lot like when she was an infant, so I am not all that unprepared. 
Best of luck on the new job. I know the time change is an adjustment! It sounds like you’ve got a great attitude though, so I think it will be a wonderful opportunity for you (and Gigi), because, well, you’ll make it one!