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If you’ve ever tossed and turned as sweat trickled down your back, you can likely stand in unity with the following: Heat is the worst. The best cooling mattress covers, however, are the solution to sweaty nights. Heat ruins your REM and slow-wave sleep (those responsible for dreaming and helping you wake feeling rested), and it wildly increases the amount of time it takes to go to sleep. Plus, it’s responsible for plucking you from your slumber and thrusting you into the cold, hard…
