Adjusting Autonomic Nervous System to Aid Sleep: Cold water immersion stimulates the vagus nerve, which is part of the parasympathetic nervous system responsible for relaxation and recovery. This activation can help lower heart rate and blood pressure, leading to relaxation and potentially aiding in better sleep quality.
Regulation of Endorphins and Norepinephrine: Immersing in cold water increases the release of endorphins, the body's natural pain relievers, which can provide a sense of well-being. Additionally, it boosts the production of norepinephrine, a hormone and neurotransmitter involved in arousal and alertness, mood regulation, and stress response.
Cold Water Immersion Temperature and Method: The ideal temperature for cold water immersion is often between 10-15 degrees Celsius (50-59 degrees Fahrenheit). The common practice involves immersing oneself up to the neck for a period typically ranging from a few minutes up to 10 minutes. It's important to ensure safety by gradually adapting to the cold and avoiding prolonged exposure, especially when starting out.