Highlights
• Cold water immersions at 10 °C for 10 min, 3 times per week for 4 weeks, have no detrimental impact on cognition.
• These short, frequent immersions might improve certain aspects of cognitive function whilst improving subjective measures of sleep and worry.
• Positive effects on subjective worry are seen after the first immersion.
• Regular therapeutic CWI in a laboratory environment has a neutral impact on mood. It is suggested improvements in mood seen elsewhere may be implicated by access to blue and green space.
• Two weeks of regular therapeutic CWI improved sleep, with fewer sleep disturbances reported.
• CWI to assist with sleep may be more efficient at times when sleep disturbances are more pronounced.

https://www.sciencedirect.com/science/article/pii/S0031938424002762