Menaceman
I think that the invited Sim can only sleep if the Sim that invited them goes to sleep as well. I'm not sure.
Lies.
From my experience, they go to sleep when they're tired.
Usually, thats never.
You see, (from what I THINK), when the visitor arrives they have a full energy bar. And you might only have invited them at 20:00.
That means it's gonna take quite a few hours for them to get tired, and so they don't bother going to sleep.
In my experience, the guests that arrive at 7 in the morning, are the ones that actually do go to sleep. whee