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.
The Divine Comedy / The High Kings / All Tvvins / Big Sleep / Aonair Dec 29, 2023 Dublin, Leinster, Ireland Uploaded by Robert Feenan
The Big Spill Music Festival 2012 Mar 13, 2012 San Antonio, Texas, United States Uploaded by Impeachman
Idiom Tribe / Butcher / Big Sleep Jul 29, 1984 Bournemouth, England, United Kingdom Uploaded by Rut
Self Abuse / Shock To The System / Idiom Tribe / Big Sleep Oct 21, 1983 Christchurch, UK Uploaded by Rut