By the time you feed them they have had their deep sleep and will wake up more easily...
I feed them every morning before I go to work and they still sleep, I have no other option since otherwise it will be in the late afternoon or evening.
My jax sleeps in the front of the cage and just opens his eyes sometimes, my panther mostly doesn't even wake.
I figured if my jax was really bothered by it he would have found an other spot by now.
I just do everything as careful as I can and don't disturb them at all other than putting in food.