Taking something that's out of whack or atypical and bringing it back to an ordinary state is normalization. When two countries in conflict agree to sign a truce, it signifies the normalization of their relationship.
Normalization is often used in a political context, for relations between nations, but you can use it for anything that's returned to normal after going off the rails. The normalization of a new parent's sleep schedule can sometimes take years. Another way to use this word is to mean "treating something bizarre as though it's normal." You may be shocked at the normalization of foul language on television — and dismayed at your family's normalization of eating dinner at 4:30 p.m.