That's pretty much what my life has been for close to 2 years now. Because of his commute and hours, Mr. Z usually leaves are 6:30 AM and doesn't get home until 8:15 PM every night, so from the moment Li'l Z's awake to he goes to sleep, it's all me. Also, because of his job, he works a lot of Saturdays, so our two days home with him are random and change weekly. When he's home, Mr. Z does try to spend as much time caring for Li'l Z as possible, but I usually still have to "perpherally parenting" because there are things about Li'l Z's day-to-day he doesn't know as well as I do. And it'll probably be that way until Li'l Z is in school.
I make it a point to go to the gym every morning to help ease my parenting stress. They have a babysitting room there (plus a closed-circuit tv that can be watched on most of the equipment), so Li'l Z gets to play with other kids for at least an hour and I can spend some time focusing on me. You may want to see if they have something like that in your area. I also tried joining a MOMS Club, which is nice and the women have been really nice, but a lot of their activities are scheduled for the mornings and that's gym-time. (The afternoon baby-sitting starts late in the day, and I can't cook dinner and get in a workout without really messing up Li'l Z's schedule.)
Other than that, I've come to appreciate Li'l Z's naps as my only breaks to do something for me. Yes, I also use them to do chores, but you can tell when he's asleep by my forums posts.
Or like right now when he's distracted by
Ni Hao Kai-Lan.
Not sure if you're wife is just tired from work (very possible), or is really not into the "little kid stage". I've known a lot of parents, including women, who just really don't know how to interact/enjoy the younger stages, but that can change when the kid/s get older.