I'm being sarcastic, the guy above you was a dumbass. Note the (/s).
Fighting effectively is the most ethical way to fight, you want the war to be ended decisively as soon as possible to lessen suffering. If that means killing sleeping soldiers, sure thing, the more of them you kill the less they'll want to fight and the easier they'll come to concessions.
It's not cowardly at all, just effective tactics, cowardice in war would be abandoning your post.
Your comment immediately reminded me of this scene from Shooter. Start at :50 where The Band's great Levon Helm(playing an old firearms guru) explains it to Mark Wahlberg. https://www.youtube.com/watch?v=mn60YWO218k
What's your opinion on how George Washington crossed the river on Christmas Eve to slaughter a bunch of drunk british?
My opinion on that is that it didn't happen.
Washington crossed the Delaware to attack a bunch of drunken Germans, Hessian mercenaries loyal to the crown. Supposedly these guys were hard as nails, real badasses- but the attack was so unexpected, so sudden and so well executed that they were defeated with less than like 20 total dead on both sides. Most of them just surrendered, too drunk/cold to put up any meaningful resistance against an organized assault.
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