Hi,
I usually have about about 4 on my bed, all depending on the mood and where they are when I go to bed.
I have 6 and basically they sleep where they want.
I used to have one that snuggled in my neck and it's lovely, I miss that and my boy , i lost him 3 years ago this coming December, Smartie , my blue and cream boy .
Merlin does like to lay right on top on me though , and he is a big lump, feels like a sack of potatoes as he is 6kg .