It's more common than you think, but most couples don't realize that they're mismatched until much further along in their relationship.

这种情况比你想象的常见，只不过大多数情侣在意识到两个人这点上不般配的时候，关系已经比较深入了。

youdao

Ones with mismatched body clocks argued more (2.13 times per week compared with 1.6 times for matched couples) and spent less time together in shared activities (about 3 hours versus about 6 hours per week).

WSJ: Who Sleeps Better at Night?