Tropical nights and HRV: interpreting a drop without panicking
Heat can alter heart rate, HRV and sleep, but a single score is not a diagnosis. A measurement protocol and safe decisions during a heatwave.
Read the analysisSleep
Sleep better with tested protocols: circadian cycles, sleep hygiene and supplements assessed critically, including their limitations.
Recent features
Kava and magnolia for sleep: effective or risky?
No human trial validates the kava-magnolia stack for insomnia. Magnolia research is mostly preclinical, and kava carries a risk of rare but serious liver injury.
20-minute Yoga Nidra: how effective is recovery without sleep?
20-minute Yoga Nidra: follow a protocol to test your recovery after a short night's sleep. Choose the right time without replacing your sleep.
Sleepless night: how to get through the day safely
After a night without sleep, no trick restores alertness. Here’s how to reduce accidents, use naps and caffeine, then recover cautiously.
Sleep inertia: why you feel foggy when you wake up
Morning grogginess often lasts less than 30 minutes, but increases with sleep debt and certain wake-ups. Here are the strategies and their limits.
Jet lag: the light and sleep protocol that actually works
Light can shift your body clock earlier or later depending on its timing. Prepare for your trip, avoid phase-shifting mistakes and use melatonin cautiously.