Muppets who grow eyelids

This is a list of instances in which eyelids can be seen on Muppets who don't normally have them, or they've been extended for those that do. This is usually done to create the appearance of sleep, when the simpler method of turning the character's eyes from the camera won't work for the scene. Some Muppets, like the early Big Bird, have closeable eyelids built in.