I usually book a combination of coach and sleeper for long distance train trips.
Is this done for personal, scheduling or financial reasons? Some years ago, I was told that a rail fan I know would book a trip partially in coach and partially in a roomette to save money over just a roomette but when I priced our trip as HBG-> ATL in coach + ATL->WAS in roomette vs HBG->WAS roomette, the former was actually more expensive.
Amtrak tends to price sleeping accommodations so as to discourage that. "Day-use" only sleepers don't sell as well (mostly, EMY-LAX on the Starlight used to do pretty well, don't know after the introduction of Business Class), so they price so as to discourage night only use, which you can see in that pricing. It used to be that distance was more of a factor in pricing than time of day and such strategies worked better, but that was a long time ago.