Here is Alberich's very fine suggestion, Ravel, Daphnis et Chloe, the same segment, 'sunrise' (lever de jour), but in the original orchestration including the full choir (wordless). It is glorious. The slow build and literal references to bird calls is one very good way to set up your day!
http://www.youtube.com/watch?v=eGqlMrAr2Fw
I also love Darius Milhaud's orchestral 'Suite Provencale.' It is a series of pieces based on French songs and dances from Aix en Provence. The suite opens with a grand air which has a broad sweeping feeling, and most of the rest have an upbeat 'happy' sound to them. I can also imagine being happily awakened by this music - sadly, no youtube clips (anyone?)
Debussy piano: the Passepied from Suite Bergamasque;
Richter live in 1977
http://www.youtube.com/watch?v=YBqbTix9Sac
unidentified pianist
http://www.youtube.com/watch?v=D4fVJW1IxYI
.... how about the very pleasant disposition of the Bach Partita No. 1 in B-flat... or at least the prelude?
Glenn Gould plays for us;
http://www.youtube.com/watch?v=KVZkuQceVkU
Best regards.