I’m not familiar with the song, but is it possible they’re singing, “I wake up happy”?
Lyrics:
http://www.sing365.com/music/lyric.nsf/SongUnid/ 5E82D9BB72F4D04C4825695E00246574
[hey, I added a space after “SongUnid” in the link here so it wouldn’t mess up the word wrap, so the link won’t work right until you take out that space]