If you’re not ready to invest quite yet, free sleep apps or a simple fan work well, too. Sunrise Alarm Clocks – A Gentle ... feature gel-infused foam or phase-change materials that help ...

Loud Alarm Clock brings with it several tricks ... it can wake you up gradually and smoothly in your lightest sleep phase, with your choice of audio. It's a full-on sleep helper and enhancer ...

and time spent in each sleep phase. ZDNET has thoroughly tested sleep trackers to find the best options based on features, affordability, and availability. Whether you're in the market for a sleep ...

REM sleep is a phase when your eyes move rapidly while you ... and it also raises your cortisol levels. Every time the alarm goes off, your body would go into a "fight or flight" response ...