Minecraft Sleeping Problem
Solution 1:
It looks like a resource pack or mod has been installed. If it's a resource pack, then you should be able to go into the resource pack list and turn it off. If it's a mod, I wouldn't have the slightest idea how to uninstall it, but there are probably multiple tutorials on the Internet willing to tell you.
About that resource pack you might think isn't doing it, try turning it off and going to sleep. If it changes back, keep it off. If it doesn't try looking for mods that might be causing this problem.