We used to start every day already angry at each other.
Him groggy and defensive because I woke him up. Me exhausted and resentful because I had to. We started fighting because he was so hard to wake up, and I'd be mad, and he'd have bad days a lot.
My first thought in the morning when I heard his alarm was that I hate him. That can't be healthy.
Now he's up before me. I wake up when I want to. I don't start the day with resentment anymore.
He doesn't feel awful leaving for work. I don't feel angry watching him leave.
Best thing we ever bought for our marriage.