White crowned sparrow survives flying into the window

When I heard the sound I knew a bird had flown into a window. I went outside and found a white crowned sparrow lying lifeless on the deck but I noticed it was still breathing so I hoped it hadn't broken its neck.
I put it in a box with some cloths and left it there for 30 minutes and then when I came back and checked it its eyes were opened and I pulled back the cloth to see if it would fly away which it did. It sat on the back wall for about an hour before it finally flew away.