Fatigue, Sleep and Mental Health:
What the Evidence Actually Says About Recovery Therapy
By Zeeshan Siddiqui, Founder, Cryo SubZero · 5 min read · Melbourne, Australia
This article is for general educational purposes and does not constitute individual medical advice. It is not a substitute for consultation, diagnosis or treatment from your doctor or a qualified mental health professional. If you are experiencing symptoms of depression, anxiety or significant fatigue, please speak with your GP. If you are in crisis, contact Lifeline on 13 11 14 or, in an emergency, call 000.
QUICK ANSWER Small studies have explored these modalities for sleep, fatigue and mood, but findings do not establish Cryo SubZero sessions as treatments for depression, anxiety, insomnia or fatigue disorders. Seek qualified care for persistent symptoms.
Research into recovery therapies for fatigue, sleep and mood is still developing. Study populations, equipment and protocols differ, so a finding in a clinical trial should not be presented as a treatment benefit from a Cryo SubZero wellness session.
Why Fatigue, Sleep and Mood Are Connected
Fatigue, poor sleep and low mood can occur together and have many possible causes. Research is exploring whether physical interventions affect these symptoms, but it does not establish that wellness sessions interrupt this cycle. Persistent symptoms warrant assessment by a qualified healthcare professional.
What the Evidence Says About Each Therapy
Hyperbaric Oxygen Therapy (HBOT) — Condition-specific research
HBOT involves breathing oxygen in a pressurised chamber. Trials have explored fatigue, sleep and related symptoms in selected clinical populations, including people with post-COVID symptoms or brain injury. Findings from those populations and medical protocols cannot be assumed to apply to general tiredness or to the chamber and sessions offered at Cryo SubZero.
Whole-Body Cryotherapy — Limited exploratory evidence
Small studies have explored whole-body cryotherapy for mood, anxiety and sleep, sometimes alongside standard medical treatment. These findings do not establish Cryo SubZero sessions as a mental health treatment. Continue prescribed care and discuss persistent symptoms with your GP or mental health professional.
Infrared Sauna and Whole-Body Heating — Early research
Small studies have explored controlled whole-body heating, sometimes combined with psychological treatment. The equipment, supervision and protocols differ from a routine infrared sauna session. Findings do not establish infrared sauna at Cryo SubZero as a treatment for depression or insomnia.
Red Light Therapy (Photobiomodulation) — Emerging evidence
Research has explored red and near-infrared light for sleep and mood, but outcomes vary with the device, application site and dose. Early findings do not establish the sessions offered here as treatments for sleep or mental health conditions.
Evidence at a Glance
| Therapy | Research focus | Evidence limitations |
|---|---|---|
| Hyperbaric oxygen therapy | Fatigue and sleep in selected clinical populations | Condition- and protocol-specific; not established for these wellness sessions |
| Whole-body cryotherapy | Mood, anxiety and sleep in small studies | Limited; no established mental health treatment benefit here |
| Infrared sauna / whole-body heating | Mood in small controlled heating studies | Early; not transferable to routine infrared sauna sessions |
| Red light therapy | Sleep and mood under specific light protocols | Emerging; device and dose vary |
What This Means Practically
There is no established number of Cryo SubZero sessions that treats fatigue, insomnia, depression or anxiety. Research schedules should not be turned into a wellness treatment course. Seek qualified assessment for persistent symptoms before choosing optional wellness sessions.
Discuss Your Wellness Goals
For persistent fatigue, poor sleep or mood symptoms, start with your GP or a qualified mental health professional. If you are considering an optional wellness session, our team can explain the experience and suitability screening. Visit Level 1, 284 Bay Road, Cheltenham VIC 3192, call 03 9022 6606, or email info@cryosubzero.com.au.
Which recovery therapy has the strongest evidence for fatigue and sleep?
Small studies have explored these modalities for sleep, fatigue and mood, but findings do not establish Cryo SubZero sessions as treatments for depression, anxiety, insomnia or fatigue disorders. Seek qualified care for persistent symptoms.
Can cryotherapy help with depression or anxiety?
Small studies have explored this question, but they do not establish Cryo SubZero cryotherapy sessions as a treatment for depression or anxiety. Speak with your GP or mental health professional and continue prescribed care.
How many sessions before I notice a difference?
There is no established session count or reliable timeline for improvement in fatigue, sleep or mood from these wellness services. Individual experiences vary, and persistent symptoms require qualified care.
References
- Hyperbaric oxygen therapy improves neurocognitive functions and symptoms of post-COVID condition: randomized controlled trial. PMC9276805
- Long term outcomes of hyperbaric oxygen therapy in post-COVID condition: longitudinal follow-up of a randomized controlled trial. PMC10869702
- Hyperbaric oxygen treatment for chronic insomnia at high altitude: a prospective, randomized, open-label, parallel-group trial. ScienceDirect
- A double-blind randomized trial of hyperbaric oxygen for persistent symptoms after brain injury. PMC11865602
- Rymaszewska J, et al. Efficacy of Whole-Body Cryotherapy as Add-on Therapy to Pharmacological Treatment of Depression: A Randomized Controlled Trial. Front Psychiatry. 2020. PMC7296110
- Whole-body cryotherapy for stress, sleep and wellbeing: randomised crossover trial findings and related literature. PMC7296110
- Janssen CW, et al. Whole-Body Hyperthermia for the Treatment of Major Depressive Disorder: A Randomized Clinical Trial. JAMA Psychiatry. 2016. doi.org/10.1001/jamapsychiatry.2016.1031
- A Randomized Trial Testing a Novel Mind and Body Intervention for Depression: CBT and Whole-Body Hyperthermia. PMC12553885
- Photobiomodulation and sleep quality: systematic review and meta-analysis. Lasers in Medical Science. 2026. Springer
- Effects of Near-Infrared Light on Well-Being and Health in Human Subjects with Mild Sleep-Related Complaints: A Double-Blind, Randomized, Placebo-Controlled Study. PMC9855677