It's simply 'pick me up and smile' musical perfection.
other versions of the song;
UmmiE
denys envy
this song gets me every time.
PQM - You Are Sleeping (PQM Meets Luke Chable Vocal Pass)
though it's pretty hard to name just one, there are many others that are on the same level of emotional attachment, but that's the first one that came to mind, so i guess it's the favorite.