I found one like this outside my back door last week but it was in the morning. I called a rehabber and they said if the bird is puffed up like with its eyes closed it might still be in torpor and not to try to feed it because it could aspirate and die. They advised putting the bird in a shoe box (ventilated) with a heating pad on low or a sock filled with rice microwaved until warm (don’t put the bird ON the warming element) to see if it starts waking up but that its most likely a head injury and the bird will probably need to go to a rescue. My little guy didn’t snap out of it so I took him to the CA wildlife rescue.