Grandparents did you suffer from sleepless nights once the grandkids where born?

I’ve recently realized that I may not want grandkids any time soon. Both my kids are no where near to having any but in talking to some friends who have grandkids I realized I like my sleep a lot. Something they now seem to lack because they always have some concern over the grandkids. My youngest has moved away a year ago and I realized the it took a while but I’m able to sleep soundly like I was able to when we had no kids. Its back to being all about our relationship like when we were first married and I really like that. We have no real obligations except to each other. Don’t get me wrong, I love our children a great deal but it was always kids first than ourselves. Its nice to be a little selfish again. However, I notice many of our friends seem to have the slipped into being psuedo parents again via the grandkids. My mom would always say, you worry about your kids but worry twice as much once the grandkids are born.
I love children and would like to have them back in my life but I just would like the fun without the constant worry like when I raised my own kids.
So to those who are grandparents. Are you a psuedo parent because your just a natural worrier or does that only happen to grandparents who suffer from empty nest syndrome or is it from lack of faith that your own kids lack parenting skills you feel only you have?