Mr Sandman is a popular song in 1950s, written by Pat Ballard and was first performed by The Chordettes. The song is about a request to Mr Sandman, a magical being who bring good dreams by sprinkling magical sand to the eyes of children while they were asleep.
The song was re-recorded over time, sometimes with male-vocalist, with the lyric altered to suit the gender of the singer. The particular remix is interesting because it involves a male singer with a mix of 60s music.