I didn't sleep well last night. I awoke at about 2 a.m. and realized my inflatable sleeping pad had lost a lot of air. I was almost lying flat on the ground, so I blew more air into it.
After about an hour, it was mostly deflated again, so I re-inflated it.
By the third time, I knew there was a leak in the pad. Predictably, the rest of the night didn't go well.