Sleep Token is a British progressive metal band from London, England, formed in 2016. The group is an anonymous, masked collective led by a frontman using the moniker Vessel. The band blend many styles, including progressive metal/rock, alternative metal/rock, post-metal, djent and indie rock.

After self-releasing their debut extended play (EP) One in 2016, the band signed with Basick Records and issued a follow-up, Two, the next year. The group later signed with Spinefarm Records and released their debut full-length album Sundowning in 2019