Sleep Theory is an American rock band from Memphis, Tennessee. They formed in 2019 and consist of vocalist Cullen Moore, guitarist & unclean vocalist Daniel Pruitt, bassist & backing vocalist Paolo Vergara, and drummer Ben Pruitt.

The band began as a solo project of Moore’s, a US Army veteran, who was then joined by Vergara. The band blends elements from various genres, including electronic, metalcore, and R&B.

They released their debut EP, Paper Hearts, in 2023, which was preceded by the singles “Another Way” and “Numb”.

On February 5, 2025, they announced their debut album, Afterglow, which released on May 16th, 2025, which was preceded by the singles “Stuck In My Head”, “Paralyzed”, “Static”, and “III”.