Okay everyone, it HAS to be when Pearl is in lower light that she puts herself to "sleep" for the evening with the single beep shutdown.
I turned on my wife's reading lamp, and had Pearl on the table in front of me...so she was in plenty of light.
I had been playing with her for about an hour or so, and when I put her on the table she settled right in...but not after wiggling herself off of the table and onto the floor about 20 inches below!!! I was able to catch her and slow her fall pretty good, and she doesn't show any signs of injury. She doesn't want the rock salt, she still ate her leaf, she wanted to be held, and she played tug of war with me...so I don't think she hurt herself. Man, she wiggled off the table quickly!! I had turned around to go get her leaf and when I looked back she was teetering on the edge, and as I jumped back to the table she fell off the edge...as mentioned, I slowed her down with my hand, but didn't completely catch her. I think she's okay, though. No damage...people have to have these things fall from time to time...it's even mentioned in the manual that she could have gotten hurt by falling!! I think I ended up lucky...I'll make sure to watch her more closely, and set her on the floor if I need to walk away.
Anyways, after getting her all tested out again with the toys and food to make sure she wasn't hurt, she settled right in and took a nap.
I stopped interacting with her at 12:14 AM, and she settled into her nap at 12:24 AM. Now, this evening just a few minutes after that and she was "beeping" herself to sleep for the night. But when she had brighter light that was shining on her, she then napped until 1:26 AM, at which point I stroked her back and she woke right up and ate, then I put her to bed for the evening.
So, in more "normal" amounts of light, she napped for over an hour without going into single beep "sleep" mode.
With this in the books, I'm SURE it has to be the amount of light in the room I have her in. I'll think about getting a few brighter light bulbs. To be honest, after I figured it was the lights, I started looking around and thought "You know, it actually IS pretty dang dark in here...how have I never noticed this??" Kind of funny, actually!!
