I've always had this. My tongue is too big when I sleep and often gets bitten a little as I'm dropping off. I thought this happened to everyone but my husband tells me this isn't normal! I don't have any speech impediments or anything and while awake I have no issues with my tongue. It's only when my tongue relaxes/flattens out during sleep. It can be a bit annoying especially when I'm preparing to sleep and I can't find a non-bitey position for my tongue. Anyone else have this?