Sky: Good research, and interesting about hair being a deterrent.
First, most large predators generally view humans as a large predator.

This is less likely to be the case where the animals have special protection and are used to human interaction, such as in national parks.
A tent is only a slight barrier to an attack. At least you'll (hopefully) hear ripping of nylon 1 second before ripping of your own flesh.

Many sleep out in the open or just under a tarp, even in grizzly country. I've slept in the open or under a tarp many times without any problems other than the distraction of wanting to stay awake to watch for interesting wildlife or shooting stars. I did once hear a coyote howl from about 20 yards away while sleeping under a tarp which startled me and made me do a quick searchlight style scan of the woods before I could go back to sleep!
Keep anything with a food or a pleasant smell away from camp at least 100-200 yards
downwind. This includes anything used to cook with, deodorant, soap, toothbrushes, and toothpaste. Hang all of this in a tree using one of the common bear bagging techniques or a bear-resistant container. Remember that black bears are expert tree climbers. It's important to do this even if the largest predator is a mouse or raccoon just because you don't want to lose your food or get a hole chewed through the tent or backpack.
If a large predator does come into your camp, it's likely just curious or hoping you left some food laying around. Loud noises will likely scare it away for good.
In the very rare case a large predator does attack at night, it intends to eat you, especially if it's a black bear. Grizzlies are more aggressive, and may be attacking just because you're there. Playing dead is the best all-around advice for a grizzly attack. From my reading, the most effective weapons to deter or end an attack are (in order of effectiveness):
1. Bear spray (large canister of pepper spray)
2. Sturdy, long stick (questionable in effectiveness against a grizzly)
3. Firearm (questionable in effectiveness against a grizzly unless you get a well-placed shot)
4. Large blade (good luck to you in hand-to-hand combat with a grizzly

)
Edit:
I should add that the only victim of a predator attack I've encountered is a bag of tortilla chips lost to raccoons. A whole pack of the snarling beasts snatched it from a picnic table when I was loading the food back into the car after a late dinner in the dark while car camping. Then, they taunted me by munching on the chips half the night right outside my tent!