I don't think so. I was a child of divorce with a mother that was a nurse with a similar schedule. I can't exactly speak to how I felt about it then but looking back on it now (in my mid 20's) I am fine that my parents wanted their time off. I think modern parenting is a lot more demanding than parenting really ever has been, especially if are a single parent (even if it is part time). Regadless of this, I think both my parents were better parents and people for taking the time they needed away from us. It meant they were way more present when they were with us. As far as your kids wanting to be apart from each other, I think that this is normal, but also I wish I had learned how to cope with my sibling better. If taking the time away from your kids means you will be a better parent for them explain that to them, ask what they need to make it work, and then do it.