There are at least two artists/bands with this name.
These are videos from concerts where Wintersleep played, so they may be of other bands that played the concert as well.
X-Fest 2016 Sep 3 - 4, 2016 Calgary, Alberta, Canada Added by Lauren Kittelson
Frightened Rabbit / Wintersleep / Three Blind Wolves Feb 28, 2013 Glasgow, Scotland, United Kingdom Added by Michael Quantrill