In most home invasion situations you have an average of 3 seconds to identify the intruder as hostile or friendly, gather your weapon, aim, and hit your intended target.
In the "standing at the foot of the bed situation" you have approx. 1 second or less (usually less) to wake up, identify the person as hostile or friendly, gather your weapon, aim, and hit your target.
To put that into perspective, an average person usually takes 1 second to draw their weapon from a holster. As you can see in the above situation the odds (no matter the weapon) are definitely not in your favor.

Nomercy448; I believe you made a great point when you stated "unless you have trained for it". Great advice no matter the weapon of choice.

Whatever you do....Talk to the experts, take a few classes, get a little experience, and think things thru objectively. I am confident you can do it.