On news years day I woke up in the morning to my 2 year old having been sick all over his bed, I'm not sure whether it happened during the night or morning as he didn't wake me (feel guilty) was slight off his appetite but was fine and eating some stuff, kept it all down during the day, went to bed that night and at midnight he was crying so went into him and he was covered in sick again, no more sick since. But I'm confused, how can it be a bug if he on,y throws up at night and not after he eats or drinks during the day? Does anyone know what this could be?