It's kind of up to you how you handle it. I personally hate short naps and will leave Medi until she either falls back to sleep herself or she needs help. She will happily lie there and chatter away for ten minutes before going back to sleep. Other times she's crying from the off and I go straight to her. Other people will just accept a short nap, get them up, and carry on. If he's happy and smiling I would guess he needs a bit more a time. Try a few minutes more,, very low key, and see if it helps.