★★★★★4.8/5 · 237 reviews · Backed by 3 published studies · 3,000mg clinical glycine dose · melatonin-free
For men who run hot at night
Stop waking up at 3am overheated.
One drink before bed. Glycine at the studied 3,000mg helps your body release heat through your hands and feet — so your core cools down and deep sleep holds. We call it Inside-Out Cooling™. Melatonin-free. Judge it over 60 nights — money-back guarantee, $77 in free gifts.
Most sleep supplements ignore the temperature problem.
Your body needs to wind down to transition into deep sleep. If you run hot at night, that process is harder — every night. And melatonin doesn't address it.
01
You wake up at 3am overheated
Run hot at night and your sleep breaks up. You wake mid-cycle, for no clear reason.
02
Melatonin doesn't address it
Melatonin sets your sleep timing. It does nothing about heat. That's why it works for jet lag but not for hot sleepers.
03
The hardware solutions are expensive
Cooling mattresses and pads cost $1,500–$3,000. Until now, there was no simple, studied way to cool down from the inside.
The solution
Everything else cools your sheets. We cool you.
Fans, sheets, and a $3,000 mattress cool the surface. Melatonin shifts your body clock. This works on the heat itself: glycine at the studied 3,000mg signals the brain's sleep-clock, your hands and feet release heat, and your core makes the ~1.5°F drop deep sleep needs. That's Inside-Out Cooling™ — the switch nothing outside your body can reach.
Mix one sachet into water 30–60 minutes before bed. That's it.
Blackberry
$59.99
One-time
Try It Risk-Free · $2.00/night · 30 sachets · $77 in free gifts (Blackout Sleep Mask + The Cooldown Protocol PDF guide)
or $47.99/mo Subscribe & Save 20% · $1.60/night · Cancel anytime
No fillers. No proprietary blends. Every compound dosed for a reason.
01GlycineAn amino acid studied for sleep quality and a cooler, calmer wind-down. In studies, 3g helped men wake up with a clearer head — Yamadera 2007 ↗ · Bannai 2012 ↗Bedtime comfort
02Magnesium GlycinateThe form of magnesium your body absorbs best. It helps muscles relax and is linked to deeper, longer sleep.Deep sleep
03L-TheanineFrom green tea. L-Theanine helps quiet a racing mind — calm but awake — so you slide into sleep without being sedated.Quiet mind
04Affron® (Saffron extract)A patented saffron extract, studied for sleep quality. In trials, it helped people wake up less during the night.Sleep quality
05ApigeninA natural compound from chamomile. It calms the brain the gentle way — no habit risk like sleeping pills.Relaxation
Verified customer reviews
What customers report.
Verified Cooldown Nightcap customer reviews — 4.8★ average across 237 reviews, April 2026 sample program. Individual results may vary.
★★★★★
"I was skeptical about the 'core temperature' angle, but I tracked it for two weeks… I'm consistently seeing an extra 30–45 minutes of REM/Deep sleep on my Oura ring compared to my baseline. It's not magic, it's just chemistry that works."
Grant S. · Helena, MT · Verified customer
★★★★★
"I didn't have trouble falling asleep, but I had trouble staying asleep. I was waking up hot every single night. Cooldown has genuinely reduced those heat-induced wake-ups. I finally feel rested."
Seth J. · Los Angeles, CA · Verified customer
★★★★★
"I've spent hundreds on 'sleep stacks' that were basically overpriced B-vitamins. This is the first product that actually breaks down the science of why it works. It's refreshing to see a brand that actually talks about the cooling mechanism."
Steve P. · Baltimore, MD · Verified customer
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Your first cool night starts here.
30 sachets. One a night. 60 nights to judge it on your own sleep — money back if it doesn't earn its place. Your first order ships with both gifts free — a $77 value.
Most popularTry It Once$59.99$2.00 per night · 30 sachets · 🎁 $77 in free gifts included
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Free Blackout Sleep Mask ($48) + The Cooldown Protocol PDF guide ($29)
Blackberry · 30 Sachets
