Short answer:
In a sensory deprivation tank, you float effortlessly in warm, silent, skin-temperature water saturated with Epsom salt. Light, sound, gravity, and temperature contrast are minimized, allowing the nervous system to slow down, muscles to relax, and the mind to enter a deeply calm, meditative state.
What Is a Sensory Deprivation Tank?
A sensory deprivation tank, also called a float tank or flotation-REST environment, is a private enclosed space filled with shallow water and a high concentration of Epsom salt.
The tank is designed to reduce external stimulation by limiting:
- Light
- Sound
- Physical pressure from gravity
- Temperature differences between skin and water
This controlled environment allows the brain and body to rest more deeply than in typical relaxation settings.
What Happens When You First Enter the Tank?
When you lie back in the water, your body floats naturally due to the salt concentration. No effort is required to stay afloat.
In the first few minutes:
- Muscles begin to release tension
- The spine and joints feel supported
- Breathing often slows naturally
Your mind may still be active at first. This is normal and temporary as the nervous system adjusts to the quieter environment.
What Happens to the Body During the Session?
As the session continues, physical changes occur gradually and passively.
The buoyancy removes pressure from the spine and joints, which allows muscles to relax without effort. Because the water matches skin temperature, the brain stops receiving strong temperature signals, reducing sensory workload.
Common physical responses include:
- Decreased muscle tension
- Slower heart rate
- Reduced physical restlessness
These responses reflect a shift toward the body’s relaxation response.
What Happens to the Mind in a Sensory Deprivation Tank?
With minimal external input, attention naturally turns inward.
Thoughts often slow down or lose urgency. Some people experience mental quiet, while others notice brief imagery or a dreamlike state. Many drift between wakefulness and light sleep.
This mental state is similar to deep meditation but does not require focus or technique. Awareness remains present, and you stay in control throughout the session.
Do Hallucinations Happen in Sensory Deprivation Tanks?
For most people, hallucinations do not occur.
Some may notice mild internal visuals, such as colors or patterns, especially during deep relaxation. These experiences are typically subtle and short-lived.
You remain fully aware of your surroundings and can end the session at any time.
Can You Fall Asleep in a Sensory Deprivation Tank?
Yes. Falling asleep is common and safe.
The water continuously supports the body, and the shallow depth prevents submersion. Many people report feeling more rested after floating than after conventional sleep due to the absence of sensory interruptions.
What Happens When the Session Ends?
At the end of the session, gentle cues signal completion.
After exiting the tank and showering:
- The body often feels lighter and less tense
- The mind feels calm and clear
- Stress levels may remain lower for hours or longer
Effects are usually subtle rather than dramatic, but many people notice improved mood or sleep afterward.
Who Typically Uses Sensory Deprivation Tanks?
Sensory deprivation tanks are commonly used by people experiencing:
- Chronic stress or mental overload
- Physical tension or fatigue
- Sleep difficulties
- Burnout or emotional exhaustion
They are especially helpful for individuals sensitive to noise, screens, or constant stimulation.
When Might Sensory Deprivation Not Be Suitable?
Float therapy may not be appropriate for everyone.
People with open wounds, certain skin conditions, epilepsy, or severe claustrophobia should consult a healthcare provider or float center before booking a session.
Most modern tanks allow the door to remain partially open if needed.
Frequently Asked Questions
What happens when you go into a sensory deprivation tank?
You float in warm, silent water with minimal sensory input, allowing deep physical and mental relaxation.
Is sensory deprivation tank therapy safe?
For most people, yes. It is considered a low-risk, non-invasive relaxation practice.
Do sensory deprivation tanks actually work?
Research supports benefits related to stress reduction, muscle relaxation, and sleep quality.
Can you move or exit the tank during a session?
Yes. You can move freely or end the session at any time.
Final Summary
What happens in a sensory deprivation tank is not dramatic or forced.
External stimulation is reduced, the nervous system slows down, muscles release tension, and the mind enters a quieter, more restorative state. The experience is gradual, controlled, and deeply calming.
For many people, it is one of the few environments where true rest occurs without effort.
