A very important playtime activity is pretending to sleep.  Allison learned early on when Daddy is asleep on the couch to whisper, "Shh, Daddy sleep!" Then she learned to lay in bed with Mommy and say, "Ni-night!" then after a few seconds lift her head up and exclaim, "A-morning!"  Now she will lay down and breathe loudly pretending to sleep and when we tell her to close her eyes she clenches them shut for about a second then opens them.