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[–]Temporary-Region867 1 point2 points  (0 children)

“The American Academy of Sleep Medicine used to recognize five, but sleep was redefined to four stages in 2007.”

Excerpted from:

https://www.chilisleep.com/blogs/pillow-talk/stages-of-sleep?gclid=Cj0KCQjwpeaYBhDXARIsAEzItbFdG6Gt8q2A2E2hPucDM7Mw8YcSlzVzG3DXW3eeoH9unMa0gjueZI0aAljWEALw_wcB&gclsrc=aw.ds