A few thoughts:

--If you're bushwhacking at night, don't expect a lot of speed. There are places, in dense brush and rough terrain, where 1 - 1.5 MPH is a pretty good rate in daylight. At night, my guess is you might do half that.
--Some sort of hiking staff or ski pole is just about mandatory (probing ahead for holes, or holding straight in front of you to part brush). Ditto a decent headlamp (though it's kinda fun to try to run dark and silent).
--It's amazing how important sound is at night. Stop and listen (instead of crashing around like a bull elk in rut).
--Night hazards include wildlife on the move (from bears to skunks), hitting wasp/hornet nests on the ground, twisting an ankle/knee, and the biggest hazard of all IME: running a stick into your eye.

Despite all the pitfalls, running around in a familiar patch of bush at night can be a lot of fun. Especially if you're playing evasion-and-escape with friends.

But I'd be loathe to do it in a survival scenario. Too many opportunities to make things an order of magnitude worse. SOP for me is to hole up and walk out at first light.