When I was a small child, Mommy would get very sleepy at times. She would tell me that it is nap time. She would take me to her bed and lie down with me. After a while she would become very quiet. I would then move away from her very slowly and quietly so as not to wake her up. I would then get out of bed and play with my toys. I do not remember what happened when she woke up and found me out of bed. Apparently, she assumed that I had my nap and simply got up just before she woke up.