I loved small areas and places I could hide and read when I was a kid. This would have been cool, and a lot easier than removing all the hard toys from my toy chest, laying blankets on top of the stuffed animals and closing the top on myself.
Good to remember, when you are having a bad day would you want someone to make it WORSE? Kids don't always know how to say what is bothering them. Be their savior NOT their problem or antagonist. They will value you for it.