Devin can't. Or, at least, he won't.
But he understands it. Oh, yes, he understands it.
He got in bed with us yesterday around 6 am. Several times, He told me and his father, "Leave me alone! I'm trying to sleep!!"
Each time he said this, he punctuated his statement with fake sleep...Hah shu, Hah Shu, Hah shu (you know, fake cartoony sleep.)