Sharing songs

I am listening to the sweet, precious sound of my 2 year old singing 'Happy Birthday' to his brother... his brother who happens to be sleeping.
They truly share a room now. And by that I mean, they enjoy each other's company and love going to sleep with their brother in the bed next to theirs.

This wasn't always the case, and it has been a long time coming:

Weston wants to share a room.
They share.
Tave cries and is very loud.
Weston can't sleep.
Weston cries.
This happens over and over and over. Jeff and I want our sleep.
West begs to have his own room.
We move him in his own room.
He hates it and wants to share a room with his brother.
We say no. He chose to have his own room.
He cries. He begs. He asks nicely. He says he'll be good and stay in his room with his brother. Even if Tave cries.
We move Weston back.
Tave cries.
West stays. But he doesn't love it.
Until now.
Now they say goodnight to each other after we have left the room.
Now they laugh and giggle.
Now they sing songs to each other, even when one of them is sleeping.