1
general::
Phrase(s): *fresh as a daisy
Cliché very fresh; [of a person] always alert and ready to go. (*Also: as ~.) • How can you be fresh as a daisy so early in the morning? • I always feel fresh as a daisy after a shower.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Well rested, energetic, as in I'm finally over my jet lag and feel fresh as a daisy. This simile may allude to the fact that a daisy's petals fold at night and open in the morning. [Late 1700s]
American Heritage Idioms