Split mattress pulled slightly apart is a neat trick.
Ahhh.... Queen bed here, so no can do...

That is one thing I do not miss at all! is having someone sleep beside me, always
'ing hated that. Always found it uncomfortable and too damn hot to sleep properly.
I am always too hot too, and she is freezing all the time.. oh well, double electric blankets and we are sweet... but her side is always too hot and she moves over to my cold side to cool down... lol
Once I'm asleep it's ok, but I often will get up and completely remake the bed around her so I can actually fall asleep!
Wouldn't trade it for anything though. I love having her sleep next to me 
This... it feels weird if she isn't in bed now... like the bed seems to huge... lol