Storm,

Thanks Glad to be back.

Ive done similar drills as well. We had nights at an old dojo I used to attend when the instructors could turn the lights on or off during sparring, or would have loud music come on in an instance. It wasnt uncommon for an instructor to jump in a match on one persons side. Other times they used objects to create enviromental awareness. Chairs, other students. Never any weapons though. These types of things are priceless tools and if you're gym doesnt do these things, they should.
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"When I let Go of who I am, I become who I might be."
Lao Tzu