The biggest but also most expensive fix is to get a new mattress. But for some reason those things are super duper expensive! So, the next best thing is to add an extra layer to your existing mattress such as the egg crate or down mattress pad. They are both heavenly to sleep on and can make a huge difference for not a lot of mullah.
Some of my favorites....
I love designing bedrooms for kids as they can be endlessly whimsical and fun. Adding lots of textures such as large cable knit throw blankets and pillows. Making the room comfy but still stylish.