As Twitchy reported earlier today, the photo is fake. But that hasn’t stopped scores of Twitter users from disseminating it:
https://twitter.com/tribalpost/status/415881744911728641
https://twitter.com/binaemanvel/status/415895361287249922
https://twitter.com/Tahoolahoop/status/415886743398010880
https://twitter.com/Johny_Gorkha/status/415840989232656384
https://twitter.com/ICrimes/status/415853470504472576
https://twitter.com/EveMadlac/status/415881440312979456
https://twitter.com/Torilife2/status/415880672452952064
https://twitter.com/j4k061n/status/415878452437213184
https://twitter.com/SanaRahim/status/415873541280518144
https://twitter.com/sugaryDEMON/status/415860136960593920
[Update]
Twitchy commenter GreenBlue1 has found this photograph of a lion sleeping: