Your Body Clock Runs on Temperature — Not Just Light - Video

Your body runs on a rhythm—and temperature is one of its main timekeepers.
Mess with it, and your sleep suffers.
Use it right, and you fall asleep faster, sleep deeper, and wake up more alert.

Here’s what the science says ????

1️⃣ Cold first, earlier in the day.
Cold plunges or ice baths trigger a short burst of adrenaline and noradrenaline—great for focus and energy.
But if you do them too close to bedtime, that alertness can delay sleep.
Studies show cold exposure lowers core body temperature for hours afterward, which is useful if timed 2–3 hours before bed, not minutes before.

2️⃣ Heat next, before bed.
Sauna or a hot bath (around 40–42°C for 10–20 min) increases blood flow to your skin.
When you step out, your body cools rapidly—a drop in core temperature that tells your brain it’s time to sleep.
A meta-analysis of 13 studies found people who heated up 1–2 hours before bed fell asleep faster and slept better.

3️⃣ Why it works.
Sleep onset is linked to a fall in core temperature of about 0.5 °C.
Cold earlier helps set up that decline; heat later accelerates it.
Get the timing right, and you’re literally syncing with your circadian rhythm.

The short version:
???? Cold = energize early.
???? Heat = relax later.
???? The right order = better sleep, better recovery, better mornings.

#sauna #saunablanket #coldplunge #icebath #circadianrhythm