Whoa, seriously? No one has said this yet?
Everytime i scroll by this thread i want to say...
YES I HAVE WOKE UP IN THE MORNING. Trolol.
As my second visit, I still can't understand how it happened without falling all over your interior lol. Must have been so cold that even the inside of your car was the exact temperature as the outside. And the pack of snow had already compacted as a whole on top of your roof...so when the sunroof opened it wasn't enough for it to detach from its pack.