Randomized controlled trials (RCTs) are considered the gold standard in clinical research due to their robust design and their ability to minimize bias. There have been a few RCTs conducted on float therapy, also known as flotation-REST (Restricted Environmental Stimulation Therapy), but it's important to note that the field is still relatively young and more research is needed for comprehensive conclusions.

One notable RCT, published in the journal PLOS ONE in 2018, titled "Promising effects of treatment with flotation-REST (restricted environmental stimulation technique) in patients with 'burnout syndrome'," evaluated the impact of float therapy on stress-related disorders. This study found that a series of 12 flotation-REST treatments reduced both psychological stress and depression while increasing optimism and sleep quality in the participants with burnout syndrome.

Another RCT, published in BMC Complementary and Alternative Medicine in 2014, titled "Effects of flotation-REST on muscle tension pain," demonstrated that floatation-REST could have beneficial effects on reducing chronic muscle tension pain, anxiety, and stress, while improving mood and sleep quality. However, the study emphasized that more research is necessary to fully understand these effects.

As for other types of relaxation therapy, there have indeed been numerous RCTs. Techniques such as mindfulness-based stress reduction (MBSR), yoga, meditation, progressive muscle relaxation, biofeedback, and guided imagery have all been subjected to RCTs with varying results:

Mindfulness-based stress reduction: Numerous studies have reported positive effects on psychological wellbeing, stress reduction, and certain physical health outcomes.
Yoga: Multiple RCTs have shown benefits in terms of stress reduction, mental health improvements, enhanced wellbeing, and physical health benefits.
Meditation: Studies have demonstrated improved stress management, reduced anxiety, and better mental wellbeing.
Progressive muscle relaxation: This technique has been shown to reduce anxiety and stress, improve sleep, and help manage chronic pain.
Biofeedback: RCTs have indicated that biofeedback can be effective in managing a variety of conditions, including headaches, hypertension, and anxiety disorders.
Guided Imagery: Research has demonstrated that guided imagery can help reduce stress and anxiety, improve sleep, and manage pain.
It's important to note that individual responses to these therapies can vary greatly, and what works well for one person may not work as well for another. Also, many of these therapies are often used in combination with other treatments, making it difficult to assess their individual effects.
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