Your 4 year old should be sleeping through the night by now.Perhaps he is going to bed too early.He may be one of those children who find it difficult to fall asleep.Read to him before he goes to sleep and let him go to bed a bit later.
Your younger son's cut on his nose sounds as if it was quite a bad cut if he needed so many stitches.The cut should heal well and the scar will probably disappear completely with time. If it does not disappear a plastic surgeon will be able to correct the scar later on.
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