I haven't had any issues sleeping in Amtrak coach seats the handful of times I've taken overnight train trips. I sleep much better than on airline coach. Amtrak seats recline pretty far and have much larger pitch than airline coach seats. It's quite comfortable for a single night, really.
Interesting; thanks for your reply. I guess I'm doomed to airplanes for work travel; I can't justify the added expense and time of the sleeper cars, and can't sleep in the coach seats :(