It's almost like letting your body nap while you are completely awake.
While
people are layin, many times they listen to
music, talk to friends, lay with pets, spoon, or for the full effect they do nothing at all.
EX: In the summer I'm always layin in the AC with my puppy.
EX: When you hung out on your bed all day and your friends asked you what you did all day you might respond "I was layin."
Lay = the actual action
Lay Sesh = The
period (or session) in which you were layin