Dead simple, like all the great melodies. Co-written by Eric Hayes of the Hooters. He, together with Eric Bazilian (the other Hooter) are among my favourite songwriters.
The list of those who covered this amazing piece (from Miles Davis to the inevitable Julio Iglesias) is probably longer than the list of those who did not.
Played very relaxed, the “ticks” that provide a soft backbeat are not noted in this sheet. The timing of the chorus is not scripted 100% correctly (will fix it someday), but if you know the tune you will get along. The bridge is a beautiful example of what you can do with four chords only.