How did you wean him out of this MadB?? I actually sleep better than I thought half sitting up but it would be nice to lie flat!! I should point out that I DON'T wear a sling at night, was just wondering I guess if there were any other parents out there who slept sitting up and how you coped.

Oh right! I thought you meant you were "wearing" him over nights!
We had many nights of upright chest sleeping. It does pass. Is he on any meds for the reflux? Neither of mine were bad enough to warrant them and it passed, but there were nights when it was the only way they would sleep.
Maybe you and your DH can take turns?