There are three phases of non-REM (rapid eye movement) sleep.
Each stage can last from 5 to 15 minutes. You go through all three phases before reaching REM.
These are some reasons why your body loves and needs sleep.
Who is Martha?
Dr. Martha Tara Lee is Founder and Clinical Sexologist of Eros Coaching. She is a certified sexologist with a Doctorate in Human Sexuality. She provides sexuality and relationship coaching for individuals and couples, conducts sexual education workshops and speaks at public events. She is the author of the book Love, Sex and Everything In-Between, and the host of the weekly radio show Eros Evolution on OMTimes Radio. For more, visit www.ErosCoaching.com or email firstname.lastname@example.org.