Biography
There are four bands with this name:
1) Sleepwalkers are a death doom metal duo from Austin Texas and Windsor, Ontario. Their debut demo "Hollowpath" was released digitally in May 2013. It can be obtained from http://sleepwalkersband.bandcamp.com.
Read full biography ↓
http://www.facebook.com/sleepwalkersdoom
2) Hardcore band from Los Angeles.
http://www.facebook.com/pages/Sleep-Walkers/111809545524708
3) A post-hardcore band from Worcester, Massachusetts.
http://www.facebook.com/pages/Sleepwalkers/162123917147252
4) An electronic collaboration between Ben Marsden and Richard Siddall-Jones.
http://www.facebook.com/sleepwalkersmusic
Biography text from Last.fm, available under CC BY-SA.