A photon is produced whenever an electron in a higher-than-normal orbit falls back to its normal orbit. During the fall from high energy to normal energy, the electron emits a photon -- a packet of energy -- with very specific characteristics.
Sleeping Dogs. Sleeping Dogs is an open-world third person action game developed by United Front Games and published by the Square Enix London Studios. Originally, the game was going to be the third in the True Crime series, but Activision canceled the game on February 9, 2011.
Summary. Dogs naturally sleep for long periods of time, and sleeping a lot is nothing to worry about in a dog that is active, enjoying his food and living life to the full. Just like people, dogs need deep REM sleep, and constantly interrupted sleep can be harmful.