I've done a google search and a search on this forum and I can't seem to find dimensions for the length and width of what would be the "sleeping quarters" for anyone camping out in their car. Back seats folded down, front seats moved up all the way. Costco currently had a thin air mattress marked down to $25 that I thought about purchasing to use for sleeping in the back of the Model 3, but I have no idea if it will fit. They also have a thin foam sleeping "pad" for $20 that is much narrower, but I still don't have any idea on the length available. My suspicion is that it's not big enough for the air mattress, which is something like 76" by 56", but I would still like to know so I can look elsewhere online. Thanks!