The average adult needs around four to six hours of core sleep every night to hit the most vital stages of rest and protect ...

"Waking up after 6 hours of sleep can be due to several factors and a combination of these factors," says Dr. Leah Kaylor, a licensed clinical psychologist specializing in sleep and trauma.

The sleep stages are divided into two buckets: REM and NREM. The sleep cycle lasts about 90 minutes, with the stages getting progressively longer as you go through them.

During sleep, its activity becomes fluctuating, alternating between peaks and troughs at intervals of about 50 seconds. The role of this activity has remained poorly understood until now.

I recently wrote a post entitled The 4-Word Sleep Trick That Stops 3 A.M. Overthinking. I received a lot of positive feedback from readers about this post and their interest in learning more about ...