One TikTok post was all it took to kickstart Sleep Theory’s rise. Not long after, they were already touring with Beartooth — and things have only gone faster since. The four-piece, led by vocalist Cullen Moore, brings a fresh mix of metalcore, pop and R&B. Their debut EP ‘Paper Heart’ already turned heads, and with ‘Afterglow’ (2025, Epitaph), they’ve taken things to the next level. Named Artist to Watch by Revolver, Loudwire and Amazon Music, Sleep Theory is now one of the biggest new names in the heavy scene.