Where's My Food?!?

Matthew sometimes falls asleep when he is eating his last meal of the day.  We try to wake him up to make sure he gets a full meal and will sleep a long time.  However, this doesn't always work as he is sometimes quite intent on sleeping.  The other night, we had woken him up a few times and finally decided that he must be full since he had no interest in waking up.  We put him down.  Half an hour later (just enough time for me to fall asleep), he was awake and screaming, "Where is my food?!?"