As of May 2026, Sleep Token continue to keep their identities tightly controlled, but a few details about the band’s numbered members are publicly documented and broadly accepted. Among them, IV is the group’s guitarist and one of the key contributors to the band’s evolving sound. What follows separates confirmed public information from speculation.
IV: Sleep Token’s numbered guitarist
Sleep Token use a numbered alias system rather than conventional stage names. The band’s members are presented as symbolic figures, identified primarily by Roman numerals. In that structure, IV is the guitarist. Public reporting and gear coverage consistently place him in the role of the band’s lead or touring guitarist, depending on the context and era of the lineup.
This numbering system is part of Sleep Token’s larger concept: the members are intentionally anonymized, with their personal identities obscured by masks, costumes, and ritualistic presentation. The numbering reinforces the idea that the band functions as a collective identity rather than as a set of individually marketed personalities.
IV’s role in the band
As the guitarist, IV helps shape the band’s signature mix of heavy, down-tuned riffs, clean atmospheric textures, and melodic lead lines. Sleep Token’s songs often shift rapidly between crushing metal sections and expansive, emotive passages, and IV’s guitar work is central to making those transitions feel cohesive.
His contribution is not just about heaviness. Sleep Token’s catalog frequently relies on contrast: palm-muted chugging, ambient delay-soaked passages, shimmering chord voicings, and layered harmonic parts. IV’s playing helps bridge those worlds, allowing the band to move from aggression to vulnerability without breaking the emotional arc of a song.
Rhys Griffiths: what is confirmed, and what is not
Confirmed public reporting
A number of online reports and fan-documented sources have identified IV as Rhys Griffiths. However, because Sleep Token are deliberately anonymous, it is important to be precise: this is publicly reported identification, not a formal on-record confirmation from the band itself.
As of May 2026, the safest factual framing is:
- IV is Sleep Token’s guitarist
- Rhys Griffiths is the name publicly associated with IV in multiple reports
- Sleep Token have not publicly and directly built a formal member profile around that real-world identity
That distinction matters. For a site dedicated to Leo Faulkner, it is worth keeping the language careful and avoiding overstatement. The name Rhys Griffiths is widely circulated, but Sleep Token’s broader anonymity means the band has never made a habit of confirming personnel details in a conventional press-release style.
What is publicly documented about him
What can be said with confidence is limited. Publicly accessible profiles and scene coverage link the name Rhys Griffiths to a guitarist who has worked in the UK heavy music world and who is associated with Sleep Token’s IV persona. Beyond that, there is not a large body of official biographical material from the band itself.
In other words, the public record is sparse by design. That scarcity is part of Sleep Token’s mythology.
Rhys Griffiths’ musical background
Verifiable prior musical history
The most commonly cited piece of prior musical history connected to Rhys Griffiths is his work with Continents, a UK metal band. Publicly available material has linked him to that group as guitarist/vocalist before or during the period in which he became associated with Sleep Token’s IV identity.
Some sources also connect him with Mourn in a frontman role. However, because this information comes from a mix of interviews, online profiles, and scene reporting rather than a comprehensive official biography, it is best treated as publicly reported background rather than an exhaustive confirmed career history.
Why this matters musically
If the public identification is correct, Griffiths’ prior experience in heavier and more aggressive styles would help explain IV’s playing within Sleep Token. The band’s guitar parts often demand both technical precision and emotional restraint. A player with roots in modern metal and aggressive riffing would be well positioned to deliver:
- low-end rhythmic discipline
- dynamic control between verse and chorus textures
- lead phrasing that supports vocal hooks
- the stamina needed for long, arrangement-heavy live sets
Sleep Token’s music is not only technically demanding; it also asks the guitarist to serve the song’s atmosphere, not just its riffs. IV’s style appears built for that role.
IV’s guitar style and contribution to Sleep Token’s sound
Heavy riffs with a melodic frame
IV’s guitar work is frequently associated with the band’s heaviest material. Sleep Token often rely on syncopated, percussive riffing that locks tightly with II’s drumming. Those riffs are important, but they are only one layer of the arrangement. IV also contributes clean textures, chordal movement, and melodic figures that keep the songs emotionally open.
That combination is a major reason Sleep Token stand apart from straightforward metal acts. The guitar is not just a source of force; it is also a source of mood.
Atmospheric passages and genre blending
Sleep Token’s songs are known for jumping between styles: alternative metal, prog-leaning structures, R&B-influenced phrasing, ambient interludes, post-rock swells, and pop-sized melodic payoff. IV’s playing sits inside that hybrid approach.
His contribution can be heard in:
- clean ambient passages that create space
- dense riff sections that anchor climactic moments
- lead guitar lines that echo or answer the vocal melody
- layered rhythmic parts that support the song’s dynamic shifts
That genre
Frequently Asked Questions
Who is the sleep token iv in Sleep Token?
Sleep Token maintain anonymity for all members. What is known comes from album credits, legal documents, and verified reporting.
Has Sleep Token officially confirmed member identities?
Sleep Token have not made official statements confirming individual member identities. Information circulating online comes from various documentary sources.
How many members does Sleep Token have?
Sleep Token currently have five members: Vessel (lead vocals), II (drums), III (bass), IV (guitar), and Espera (backing vocals and keys).
Where can I find official Sleep Token information?
Sleep Token's official website and social channels are the authoritative sources for news, tour dates, and releases.
This page draws on documented information from album credits, verified interviews, and published sources. Where identity claims remain officially unconfirmed, they are noted as such. Last reviewed: 22 May 2026. For official Sleep Token information, refer to the band's official channels.
Related: Sleep Token Identity · Sleep Token Band Members · Who Is Leo Faulkner?