Morning and evening-type differences in slow waves during NREM sleep reveal both trait and state-dependent phenotypes.

PLoS One · 2011 · PMC3150370 · PMID 21829643

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0.2000

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0.2000

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did not reach statistical significancep = 0.2not close (p > 0.1)

Nevertheless, SW amplitude contributes to the between-chronotype difference in slope in the present sample since the Group-by-Sleep Pressure Level interaction in slope did not reach statistical significance when controlling for amplitude (ANCOVA: F 2,38 = 1.6, p = 0.2).

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