I am guessing this is your first DC? With my first, it was the same way. At some point, I did what others have suggested - creating mandated quiet time. It's important to demonstrate self care and boundaries.
It all kind of took care of itself when DC #2 came around. You just gotta tend to the baby sometimes!
FWIW - DH is PG and is STILL like this in his 40s. But he can take care of his needs himself. He is up at dawn or beforehand, runs several miles, goes to work at a rather intense job and when the rest of the world goes home to decompress, DH is still going - reading, hobbies, walking or running some more, socializing, whatever. Some people are just hard wired this way.
