When is it okay to go back to sleeping laying down?

Today i've hit one week out from a Septoplasty and Bilateral Turbinoplasty.
For the most part it seems to be healing well with just a little blood, but still a lot of congestion (and splints for another week).

I've got a pretty comfy recliner chair nest going and have been sleeping mostly upright since but was just wondering when most people went back to laying down to sleep? Or if theres a milestone to be looking out for?