We used to have one. I wish we still had them since they are lighter and the more grain we haul per trip the better. But, I have heard of taller guys complain about not being able to lean the seat back far enough and stuff like that. I am only 5'9" so it doesn't bother me. The sleeper can be nice if something goes wrong and your stuck waiting somewhere for a few hours just go in in lay down.
This is what I do and I love it, but I think my job is probably easier than most other day cabbers. I usually do about 55 hours per week. I do all truckload pickup and deliveries. Also my truck is assigned to me, I take it home at night and don't have to slip seat with anyone, which I think is pretty uncommon in a day cab. Oh and I am 6'5" and I fit in it fine. Just as much leg room as i had in the old sleeper truck. Are you looking at a particular company?
Not sure if i was gonna go and lease on to or run under my own name theres lots of van loads in my area