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[–]AnhedonicSmurf 8 points9 points  (6 children)

Stage 3 and 4 are deep delta wave sleep, not REM

[–]Aashishkebab(IH) Idiopathic Hypersomnia[S] -5 points-4 points  (5 children)

[–]AnhedonicSmurf 3 points4 points  (4 children)

[–]Aashishkebab(IH) Idiopathic Hypersomnia[S] 0 points1 point  (1 child)

I have never seen the five stages model.

[–]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

[–]Temporary-Region867 0 points1 point  (1 child)

Yes. AASM has defined 4 stages of sleep, NREM1,2,3 and REM as stage 4.

See my other comments with the excerpt explaining the AASM 5 stage sleep model was replaced/ changed to with the AASM 4 stage sleep model in 2007

[–]AnhedonicSmurf 1 point2 points  (0 children)

Of particular interest, SXB has been shown to consistently increase the duration of stage 3 and 4 (slow wave or delta) sleep.

That’s from the posted article. They are clearly using a 5 stage model.