I had to bottlefeed my 2nd (and pump) against my will. She had a very weak suck, wasn't gaining, etc. so to get her to gain weight, we had to bottlefeed her for the first 6 weeks. It was awful. I could not understand why anyone would choose that . . .oh, and a few times at first, my milk supply had dwindled due to her poor suck, so we had to giver her formula. She did not sleep any longer, contrary to what everyone says.
I pumped/gave my 1st child bottles once a week when I went to school at night, so I was not new to pumping.
This is what happens when I nurse at night . . .wake up, don't get out of bed, no one else wakes up, feed the baby, and I can just sort of sit there. (I no longer lie down to nurse at night . . .I can never sleep through it and they tend to wake up more if they associate me lying down nursing with lying down, if that makes sense.) Sometimes I doze, sometimes I watch TV (in the early weeks). Relaxing.
Bottle? Get OUT of bed, baby is crying, have to heat it up . . .very tired . . .hold the baby, then go back to bed.
Now, one thing to consider is, down the road . . .nightweaning. I do it at about 18 months. I feed on demand all day, but at some point, the kitchen closes at night and we just sleep together. Saves my sanity and the kids have always started sleeping 100% better . . .yet the cuddling is still there.
Some people can totally sleep through nursing sessions. I envy them!