Thank you wolfstarr.
I'm doing that more and more. I told my daughter "DO NOT CALL ME WHEN YOU'RE DRUNK ANY MORE". If she wants to talk about something she can call me but only when sober. I am sick and tired of her whining and calling me in the middle of the night, drivelling about all the shi....t she always does. Then comes morning, she'd forgotten all about it, while I'm left being upset for the rest of the day, or days.
I am learning about the boundaries more and more and you're right, it feels good.