Fine, merge it with the Callie sleeper for a Scotland-Weymouth service, maybe an extra one that starts up north Scotland and calls at all stations to Edinburgh where it merges, Carlisle, Preston, Manchester Piccadilly, Stockport, Stoke-On-Trent, Birmingham New Street, Birmingham International, Winchester, both Southamptons, Brockenhurst, Bournemouth, Poole, Wareham?, Dorchester South and Weymouth.
Well it seems to me that the most obvious future sleeper use is long distance inter regional services. Cross country is very fast between stations but then waits for ever at those stations where it has arrived early and then some... so as not to be late at the next.. and prob not to incur penalty charges given that it is a difficult route.
Sleepers don't need to be fast and could provide (indeed the Scotland South West sleepers used to be the most heavily used in the UK as I understand it) good links for people who don't want to fly or to spend almost all day
travelling!