The manufacturer of this air mattress goes to great lengths in the instructions to tell the user that ALL air mattresses leak, and that this one will too.
From personal experience, I would say that most, but not all, air mattresses leak, to some degree or the other, so when I buy one, I wish for the best and hope that I get one that does not leak too much and allows me to sleep through the night without going so flat that I end up sleeping on the ground.
Unfortunately, while some of the reviewers said that their Wenzel Stow-n-go Insta-bed stayed up all night, this was not the case with mine. The first seven days, it leaked enough during a night that it needed was low the next morning, but not so much that I had to get up to pump it up during the night. When inflated, it was very comfortable to sleep on. The next four or five days, it began leaking to the point that I had to get up in the middle of the night and reinflate it, a process that took three or four minutes for the mattress but some thirty or forty for me (to return to sleep). After two weeks, it leaked so much that I had to get up twice each night to reinflate it, and at that point, it lost all usefulness.
I returned the product for a refund and will look at mattresses from other manufacturers. Perhaps someone will be able to make a mattress that will hold its air overnight, or at least to the point that it will allow me to sleep through the night in comfort and reinflate it the next morning after I awake.
Unfortunately, the Wenzel Stow-n-go Insta-bed is not the one, and I cannot recommend buying it.