I had a psychology class in high school where I learned from one of my teacher's tangents that it's best to either take very short naps or long naps and that there's a certain range where you're bound to wake up groggy because of how sleep cycles work. Like don't take 45 minute naps. But I don't remember which side 30 minutes fell in that! He also taught us that having a consistent sleep schedule is better than getting more sleep some nights. These are just some things I thought of reading this post.

In the past I've usually taken naps because I'm feeling depressed and don't want to do anything. In my case that was the cause/effect but it's never been a habit of mine. Maybe you need a productive outlet for working through feelings about your mom's situation?