Yep!!! I have a toddler and regularly get nights where I don't sleep enough and it's hard to differentiate between DP/DR or just a lack of sleep.
Ten years ago when I had harm-OCD and DP/DR, it got better after five months (I had started working, so didn't have time to focus on it anymore). After "recovering", AKA: getting my mind off of the DP/DR, I clearly remember that I went to a cousin's wedding and after being awake for 24+ hours (between the flight, time difference in California, etc, etc) and I got hit with MASSIVE dissociation. I was walking around the hotel trying to find my room and feeling like I was in a dream-state, nothing looked real or familiar. I panicked thinking "dear god, it's coming back! this is WORSE than it was before!!" and it was just that I was exhausted. I slept that night and was better the next morning. Thank goodness.
I've found that DP/DR almost feels like being tipsy/drunk/high...the same feelings people get when they are super exhausted. Ever hear those warnings saying that being tired behind the wheel is the equivalent to being tipsy and having alcohol in your system? I guess it's the same part of the brain. Who knows, but yeah, it makes DP/DR worse for sure.