I'm on parental leave; am I depressed?

After dropping the kids off at daycare,
I go to the library and read for about 2 hours.
Then I come home, clean, cook, read for about an hour, and pick them up right away.
I play with the kids, feed them, put them to sleep,
and then I read for another 2 to 3 hours.
I find myself constantly looking for books to read,
but I wasn't like this before.
Could I be depressed?