It depends, really. Exclusive pumping is harder than supplemental pumping, but I don't think anyone is well-served by a plan that basically builds in sleep deprivation. If you stress your body out, your body is likely to go into survival mode, and expend minimal energy. You'll sleep a lot, you won't feel up to doing anything strenuous, or much of anything, and you won't produce a lot of breastmilk.
I got a lot of bad advice from a hospital LC when my son was a newborn, and wound up pumping every 2 hours round the clock until I had a hideously painful case of oversupply, and also felt like absolute crud. When my second baby was born, she went straight to the NICU (she was 7.5 weeks early), and I pumped every three hours between 6 a.m. and bedtime (which was determined based on how I felt about staying awake), and slept 5-8 hours at night. If I woke up feeling tight in the chest, I pumped, but I often didn't wake up. I wound up with more than enough milk for the baby, and I felt a lot better than I had the first time through.