Cats will find the oddest places to sleep. Sometimes they will actually use the bed you bought them.
Sometimes, they will use the bed you bought the other cat, even though this bed is too small. 
They tend to take over your bed
And if that doesn't work, they will take over the dogs' bed.
There are cats that need more than one bed.
Of course, there are two cats who like to sleep in one bed.
Up high places are warm and safe.
Cats get stuck in the sun.
Sometimes, they just like to be alone in the linen closet.
And sometimes, they like to sleep where the action is.
