The micro-phenomenology of Floatation-REST
Helena Hruby, Marc Wittmann, Stefan Schmidt, Prisca R. Bauer
BMC Complementary Medicine and Therapies November 6, 2025 Peer reviewed DOI: 10.1186/s12906-026-05415-1 via OpenAlex
Summary
Participants in a micro-phenomenological study of Floatation-REST, a sensory isolation method, experienced four distinct phases during their sessions. After acclimatization, they transitioned into an altered state of consciousness (ASC) characterized by positive emotions, deep relaxation, and a loss of spatial and temporal orientation. The ASC phase intensified progressively, suggesting potential therapeutic benefits for mental health conditions. Fourteen participants were interviewed to explore these experiences.
Study at a glance
| Design | micro-phenomenological study |
|---|---|
| Sample size | 14 |
| Population | individuals undergoing Floatation-REST sessions |
| Key finding | Most participants experienced four distinct phases during Floatation-REST, culminating in an altered state of consciousness marked by positive emotions and deep relaxation. |
Abstract
This micro-phenomenological study examines altered states of consciousness (ASC) during Floatation-REST, a sensory isolation method where individuals lie in a tank filled with Epsom salt-saturated water in complete silence and darkness. Salubrious effects of Floatation-REST have been shown in persons suffering from mental health conditions; these positive outcomes might be related to the experience of ASC. Micro-phenomenological interviews were conducted with fourteen participants who completed a 60-minute Floatation-REST session, to capture the generic structure of ASC. We found that most participants experience four distinct phases during a session (diachronic structure): after an initial acclimatization phase (1), participants experience a transitional phase (2) that prepares them for a subsequent ASC phase (3), followed by a phase of temporal and spatial reorientation (4). The ASC phase is characterized by the experience of positive emotions, deep relaxation, a loss of orientation in space and time, and a reduction in bodily sensations and thoughts (synchronic structure). The characteristics of the ASC phase emerge gradually and progressively intensify. This micro-phenomenological analysis of Floatation-REST sheds new light on the potential of this therapeutic technique. We discuss possible future research and therapeutic applications of Floatation-REST.