Why the bed?

Dawna and Adele love to play on our bed. Still trying to figure out why. Seems that they have fallen off enough to hate the bed, but they are resilient and keep on coming back. It's probably because I like to sleep with so many pillows and blankets. Lots of stuff to jump on and play in. These pictures were taken before the "playing" got too rough. When the two of them are on the bed together, I am reminded of the "No More Monkeys" rhyme... somebody ends up bonking their head or something. Here, Adele is putting Dawna to bed and kissing her good night. Then, there's their mischievous smiles, but still very cute.