In 1982, Steve Winwood released an album - Talking Back to the Night - that featured this single, which ended up being a minor hit - hitting #70 on the Billboard charts, and getting the former Spencer Davis Group member some attention.
The song is about a former lover that the narrator hopes will return to him someday.
In 1986, Steve Winwood had a huge enough year to warrant a greatest hits album - Chronicles - in 1987. Included on that album was a remix of "Valerie", which ended up being a much bigger hit (US Top 10) than the original.
Both are among my favorite unsung songs by any artist.