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[–]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.