DS sleeps from 8pm until 6 or 7am, uninterrupted every night. He'll nap for between 40 minutes to an hour each day, yet he is constantly tired, has bags under his eyes and now it's affecting his moods, he's gone from being a really good child to bring so grumpy and disruptive it's like I don't know my own child. He takes a daily vitamin, and he won't have any more naps during the day or go to bed any earlier at night.
This has been the case for about a fortnight now.
Is this normal or should I be concerned? "Dr Google" says to get him checked out but is it really necessary?