I thought that I was just going crazy! It has just happened to me once, though.
I tend to send my sim into the shower right after work (around 6ish) and then I'll take care of some other things while she's in there. It was like 2 AM sim-time that I noticed that she had not gone to bed like usual and I saw that she was STILL in the shower! She was just standing under the water and deliriously tired and her hygiene was still red. And not only that, but so were her hunger and energy bars!
I usually don't have to worry about those since autonomy is on and she usual takes care of her own needs, but I guess I'll have to keep an eye on her while shes bathing.
