An MD-reviewed 2026 buyer's guide to the 7 best smart mattresses for deep-sleep recovery, benchmarked against 2024-2025 clinical data on thermoregulation, REM architecture and HRV-driven automation.
Oura Ring 4 vs WHOOP 4.0 — compared head-to-head on HRV accuracy, sleep stage detection, and real-world deep sleep improvement. Based on 2025 clinical validation data from 500+ nights. Find out which tracker delivers actionable data that actually changes how you sleep.
A 2025 randomized, double-blind trial of 155 adults confirms magnesium bisglycinate (250 mg elemental/day) significantly improves sleep quality. Here is the exact dose, timing, mechanism, and why this form outperforms all other magnesium types for deep sleep and recovery.
