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A solid bedroom door with a reinforced frame, a deadbolt on the bedroom, and an alarm. If the alarm goes off, assuming no one else in the house that may need securing (e.g. young children), stay put and call 911. No need to do a building clearing exercise.

If you wake and your wife is not with you, the most logical assumption is that she is somewhere else in the home. To then shoot someone you find in the kitchen? Hmmm. . . .