deflating sleeping pad

Yup, pretty much.

You can avoid that by inflating twice. Once when you set up camp. After it cools down blow it up again with a couple breaths of air.

In cold weather, don't be afraid to blow it up firmly the first time. It will loose pressure as it cools. Later on, you might not want to blow it up quite as firm. I have not heard of the newer ones delaminating, but it could still happen.

Cold air compresses, warm air expands. Very basic physics. Don't worry about it, but be mindful that if you fill it to capacity in 0º temperatures and then bring it inside your living room, you could pop it.

You can also make/buy a pump bag for it. By pumping in ambient air, you won't notice the shrink as much, and also no humidity from your lungs to funk up the inside. They also make pumps that use foam like in self inflating pads.

thanks guys. think i'll be bring the foam pad when i go out 'til i get the hang of inflatable pads.