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Cold Plunge and Sauna: How They Help With Stress and Emotional Regulation

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Cold plunge and sauna are everywhere right now, usually wrapped in talk of fat loss, inflammation, and a certain kind of bro culture. I am starting a new series on the wellness practices that genuinely changed my life, and this is the one I have a real relationship with. Not the trendy version. The reason I keep coming back to it is something almost no one talks about, and it surprised me too.


What does a cold plunge actually do?

It pulls you out of your head and back into your body. Cold and heat are both forms of hormetic stress, which is short controlled stress that makes your system more resilient over time. The cold activates a stress state and the sauna moves you toward calm. Moving between the two teaches your body that you can enter stress and come back from it, and that return to baseline is what emotional regulation really is.


Are cold plunges and saunas good for you?

For me, yes, in a way I did not expect. In the cold, your brain releases norepinephrine and dopamine, and that dopamine can climb to about two and a half times your baseline. The lovely part is it stays elevated and drops off slowly, so there is no crash. The sauna then activates heat shock proteins linked to recovery and reduced inflammation while your nervous system settles. Cold exposure has been shown to reduce stress, improve mood, and steady your stress response. Sauna has been linked to lower cortisol, better relaxation, better sleep, and over time, cardiovascular health.


How does cold plunge help with emotional regulation?

It works through the body, not the mind. We are taught to manage emotions by analyzing and reframing, but rarely through somatics. Cold water triggers the dive reflex. Your heart rate slows, your breathing shifts, and your attention narrows, which interrupts the looping and forces presence. There was a heavy morning I could not pull myself out of, and by the end of a single session everything had quieted. I was not suddenly fine, but I was not overwhelmed. That moment sold me completely.


What is a good cold plunge and sauna routine?

I followed a Huberman-style protocol. Start with a cold plunge, move into the sauna for fifteen to twenty minutes, then alternate, always finishing on the cold so your body warms back up on its own. In the plunge, aim for around a minute to two minutes and let it stay hard, because the point is entering the stress response and getting out, not getting used to it. Box breathing helps the time pass. I cover the weekly targets, the head-dunking question, and my full setup in the episode.


Quick questions

How long should you stay in a cold plunge?

Around a minute to two minutes is plenty. It is meant to stay challenging, so the goal is not to last longer.

Should you do the sauna or the cold plunge first?

I start with the cold and alternate, finishing on the plunge so my body warms back up naturally.

Is cold plunge good for stress and anxiety?

It can be. Cold exposure has been associated with lower stress, steadier moods, and a calmer nervous system. It is a practice, not a cure.

Do cold plunge and sauna help with sleep?

Sauna has been linked to better relaxation and better sleep, and the full hot-cold cycle helps your body recover.


Come practice with us

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The science, sourced: Drawn from the practice and research Merisa references in Episode 6, including hormetic stress and nervous-system adaptation, the dive reflex, dopamine and norepinephrine response to cold exposure, heat shock proteins and recovery in the sauna, and a Huberman-style protocol. As noted in the episode, research specific to women and cold exposure remains limited.

 
 
 

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