<human>: Our pack includes a 3-yr old mixed breed lab/hound/(pit?) named Tails. She roams the house freely during the day and is SUPER sweet to everyone... except when you wake her up. The most extreme case was when my wife came in one morning to wake Tails up and send her outside for her morning potty break (we have a huge fenced in back yard, so we just send her out to do her business then let her back in when she's finished - no messes in the house, great dog). At any rate, the wife bent over Tails, and the dog just snapped and caught my wife on the nose. 

So, after the hospital visit for stitches, some soul searching, and a decision that we would try to figure out a remedy for this reaction (either through changing our behavior or through training Tails somehow). We have had almost no success. The other night, Tails is asleep not very near me on the couch. I set the laptop down near her not thinking about it, and she snapped at me (didn't catch me). She appears remorseful after the fact, realizes there's something not right and that we're not happy alphas. What would an alpha do to stop this reaction, if anything?

Really just want some advice on exercises we can safely do to help stem the aggression when Tails wakes up. We've NEVER experienced aggression from her except when she sleeps. I can remember this happening at least half a dozen times since the initial "nose" incident. Any advice?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Sleeping dog snaps, but is extremely friendly, loving, loyal, and not aggressive in any other way. Are there exercises that help to discourage this spontaneous aggression that we can be doing safely?