Yep, I had the same with a blow up mattress but by the time it went flat I was always to warm to get upIt's my alpkit numo blow up mat. It keeps going flat and needs blown up 3 times overnight as the valves leaking but I don't want to give up on it as it fits my bivvi bag well. I will try plastic grease on the valve or something next... Alpkit has sent me a new one already a couple of years ago so I've had about 3-4 years frequent use, but I can't help but overtighten plastic things....In fact I'm going up to look at it now!
Have you had the courage to tell kit tartThe wife
nothing changes thenNope