There are at least three artists that have performed under the name Big Sleep: (1) An Irish-Italian group based out of Dublin, Ireland; (2) American/German singer-songwriter Stefan Schwerdtfeger; and (3) a 1970s band from Wales.
These are photos from concerts where Big Sleep played, so they may be of other bands that played the concert as well.
Idiom Tribe / Butcher / Big Sleep Jul 29, 1984 Bournemouth, England, United Kingdom Uploaded by Rut