I slept in the drivers seat of my Defender once...

The following 30 seconds were some of the scariest of my driving career


Dont sleep in the vehicle... Get a nice double swag for you and SWMBO and just sleep next to the vehicle... It'll be warmer and a damn site more comfortable....

Last comfy vehicle I slept in was my XC panel van, but then that had a full mattress, was insulated and lined throughout.... Oh, those are great memories