Sleep Optimization·1 min
Why Cold Bedrooms Beat Cold Showers for Deep Sleep
Everyone talks about cold plunges. The bigger sleep lever is the temperature of the room you sleep in. The number that matters is 65°F.
May 15, 2026
Sleep Optimization
Circadian rhythm, recovery, sleep hygiene.
Sleep Optimization·1 min
The 90-Minute Cycle Trick: Why You Wake Up Tired After 8 Hours
Eight hours sounds right, but waking mid-cycle leaves you groggier than waking after seven. Here's how to time your alarm.
May 15, 2026
Sleep Optimization·1 min
Your 'Sleep Debt' Doesn't Work the Way You Think
Sleeping in on Saturday doesn't pay back the sleep you lost during the week. The actual recovery curve is messier — and more forgiving.
May 15, 2026