Danny,

When I have accidental bumps like that now the first thing I ask myself is, "Would I be worried about this in my pre-concussion status?". I have great anxiety about hurting my head as well and I've found this to kind of help me with it. I highly doubt that you can hit yourself hard enough in your sleep to cause any damage. Your subconscious is probably so focused on any hit and that's probably why you woke up. I imagine the hit could've only happened while tossing/turning in your bed, which couldn't have been that hard.