After your infrared sauna session, you feel warm, relaxed, and perhaps a bit floaty. That post-session glow is real, but what happens in the next hour matters just as much. Proper aftercare supports recovery, helps you feel great, and fosters a safe, sustainable routine.
Here’s what the research tells us, and what you should actually do when you step out.
What happens to your body after an infrared sauna session?
An infrared sauna raises your heart rate and blood pressure, similar to moderate exercise. Your body doesn’t immediately return to normal when you step out. Blood vessels stay dilated, blood pressure can dip below baseline, and your core temperature remains elevated as your body readjusts.
On top of that, you’ve been sweating. A standard 15–30 minute session can easily result in 500ml or more of fluid loss, along with electrolytes such as sodium, potassium, and magnesium.
This combination of residual vasodilation, lower blood pressure, and mild fluid loss is why some people feel lightheaded if they stand up too quickly or jump straight back into activity. It’s not a cause for alarm, but it is a signal to be a little thoughtful about what you do next.
A 4-step routine for after your infrared sauna session
Step 1: Sit Down and Rest (First 10 Minutes)
Most research protocols that monitor heart rate and blood pressure after sauna use include a 10–30 minute quiet rest period for a reason: it supports your cardiovascular system in gradually returning to baseline, and reduces the risk of dizziness or fainting during the hypotensive window.
Resist the urge to immediately jump in the shower, make a phone call, or head to the gym. Give your body five to ten minutes to relax and recalibrate first. You’ll feel better for it.
Step 2: Cool Down Gently
Once you’ve had a few minutes of rest, you can start cooling down, but gently is the key word here.
Traditional sauna culture (Finnish saunas have been studied extensively, and the recovery principles translate well to infrared use) favours a staged cool-down approach: fresh air first, then a cool rinse or cold shower. This gradual approach supports the return to normal body temperature without shocking your system.
A cool or lukewarm shower is a good option once your breathing has settled and your heart rate feels calm. Many people find it genuinely refreshing, and it does help accelerate surface cooling. Cold plunges are popular, and they’re fine if you’re accustomed to them. If you’re new to far infrared therapy, however, keep it simple and just go cool rather than ice-cold to start.
Avoid hot baths, spas, or sitting in the sun directly after your session, as these can prolong heat stress at a time when your body is trying to cool itself down.
Step 3: Rehydrate (And Don’t Forget Electrolytes)
This is arguably the most important step, and the one most people underdo.
Aim to drink at least 500 ml of fluid in the first 30 minutes after your session, and up to a litre if your session was longer or you were sweating heavily. Water is a great start, but if you’ve had an intense session, consider adding electrolytes. Plain water doesn’t replace the sodium, potassium, and magnesium lost through sweat.
Good options include:
- Coconut water (naturally rich in potassium)
- Mineral water
- A quality electrolyte drink or tablet
- Water with a small pinch of sea salt and a squeeze of citrus
What to avoid: alcohol and caffeinated drinks
Alcohol adds to the blood pressure drop and contributes to further dehydration, which is the opposite of what you need. Caffeine has a mild diuretic effect and can worsen your fluid deficit. Save the coffee or wine for at least an hour afterwards. Note that you should avoid these drinks before your sauna session as well.
Step 4: Ease Back Into Activity
Think of the post-sauna period a bit like the recovery after a moderate workout. You wouldn’t sprint home from the gym.
If you feel fully cooled, well-hydrated, and clear-headed, gentle movement is fine. A short walk, some light stretching, or simply going about your day is perfectly appropriate. What’s worth holding off on is intense exercise, heavy lifting, or anything that significantly raises your heart rate again until you feel completely back to normal.
Dizziness, nausea, heart palpitations, or unusual fatigue after your session are signs to extend your rest period and skip additional sauna rounds that day. These symptoms aren’t common, but they’re worth taking seriously.
A simple post-session checklist
If you’re building a regular infrared sauna practice, this routine takes about 30–45 minutes total and sets you up for the best results:
- Exit the sauna and sit or lie down in a cool area for 5–10 minutes.
- Take a cool or lukewarm shower once you feel settled.
- Drink 500 ml–1 L of water or an electrolyte drink over the following 30 minutes.
- Rest in loose, breathable clothing while your body returns to its normal temperature.
- Resume normal activity once you feel clear-headed and fully rehydrated.
Your sauna routine doesn’t end when you step out
What you do in the hour after your far infrared therapy session helps your body recover and lets you keep showing up session after session. Treat your post-sauna time with the same care as the session itself, and you’ll find you feel better, recover faster, and get more out of your practice over time.
If you have any underlying health conditions, particularly cardiovascular ones, it’s always worth checking in with your GP before starting a regular sauna routine.