Sleep Token are a British rock band from London. Formed in 2016, the group are an anonymous, masked collective led by a frontman using the moniker Vessel. They have been categorised under many different genres, including alternative metal, post-rock/metal, progressive metal and indie rock/pop. 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 in 2019 and released their debut full-length album Sundowning, which was followed in 2021 by This Place Will Become Your Tomb.