The phase of life when your children prepare to leave home is really weird!
The goal of parenting is to raise productive self-sufficient young adults. Then a day comes that you realize that your role has changed, you are not in charge or responsible for- I guess that is the big one- the mantle of responsibility is now firmly on them and not you.
It's like the world shifts 2 inches all at once and you need some quiet time to yourself to get realigned with this new reality. Lucky for me, I have the studio.