We're such sensory creatures and are constantly interpreting data from our environments - we can't help but NOT be affected by our environments. Just moved to California and have been in a hotel for 2 months, I desperately miss having an office space. When I closed the door and put on my headphones in that space it was definitely "go" time, and I felt safe in the confinement of it. Working on a couch on a laptop is definitely not the same.
I've tried working from the couch many times in the past. Aside from the poor ergonomics, all the subtle signals are promoting the exact opposite of work!