Was the van level? I sleep very well in my Duvalay sleeping bag on a RIB bed but the slightest slope down towards my head ruins any chance of a decent night's sleep.
Haha, yes I started with a headrush due to the van having a slight tilt towards the back, so I spun around to have the blood run towards my feet, but it's the bed and mattress I found really uncomfortable.
Strongly looking at this mattress - Exped | MegaMat | 10 | LW+ | Duo | Ruby Red | Sleeping Mat £249.99
My airbed is fantastic for camping, but it's way too thick too sleep in the van.