I am a c/m, I caused a great ruckus on the UK c/m site by saying I didn't think it right for babies and children to sleep in pushchairs. I still believe a c/m should provide a cot, or bed if appropriate. I have two travel cots in my spare room, but if I have a new baby I bring one down to the sitting room or dining room which is cooler, so I can hear them and keep an eye on them more often.
In the conservatory we have a huge sofa, as it used to be our family room, sometimes the littles climb up with a book and doze off, you can get three of them on it, and they look so sweet fast asleep!
There are big concerns about children asleeping in baby car seats, my sister is a midwife and says they have research that says there is ore incidence of respiratory problems in small babies as they go in the carseat, then onto the pushchair frame and when they get home they are maybe asleep, so left in the seat for a whkle. It is too long, especially for their backs, babies should be flat.
If you think about it, how comfortabe is it for you as an adult to sleep upright in an airplane seat? That;'s what is must be like in a pushchair. (IMHO)