How Can Sleeping Go Wrong?

We have a Queen-Size bed. If you're like us, you'll understand that some couples have to negotiate this joint sleeping arrangement after years of sleeping by themselves in single beds. When you're sleeping in a single bed, it's pretty easy to work out where to sleep. You arrange your body like this:

Or if you're a man, like this (it's a protective thing, I think):

Not too hard to work out who sleeps where. But once you're a couple, you have to negotiate who sleeps where on something that's the size of this: Not easy. It was my Mum who first alerted me to these hazards. She is quite small and my father is, I think, decended from giants, so their sleeping arrangement has often been like this over the years:
A hug is nice before you drift off, but for catching some serious "Z"s, we prefer an "Individual Freestyle" sleep formation. If you can successfully intermingle bodies and limbs while also getting a good night's sleep, by all means knock yourself out. But in the world of Individual Freestyle Sleep, I think that this is how a successful Co-Sleeping arrangement should work:
But last night, I was having trouble sleeping. This was due to a few things: I have been sick for a week now and was having trouble breathing, I was absolutely furious about something from yesterday and had apparently decided to spend some precious hours ruminating instead of sleeping, and also because this was the sleeping arrangement:Perhaps this picture isn't totally representative, because when it comes to my body, objects are larger than they appear.

Does anyone else find it hard to get the space you need if you share a bed?

And what about when kids come along? You dream that when they come in and snuggle with you in the morning, it will be a little bit like this:

But we know this to be untrue. In actual fact, it's more like this: