This is a photo of six (even though it’s hard to make out all six) bear cubs in Wild Enclosure #2. They had been playing as well as foraging, and all collapsed in the sun. It is to be expected that they will get tired and rest for ever longer periods now that hibernation time is getting closer.
As hyperphagia winds down, bears eat less and sleep more. This is to be expected, so the cubs are behaving like bears in the wild.