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Minutes spent in each state across two hour intervals: (A) wake; (B–D) N1, N2, N3 non-REMS; (E) REMS. P-values refer to treatment ⨰ time interaction in repeated measured ANOVA. *P=0.003, beetroot juice (BJ) vs placebo value at same time, Fisher’s LSD.
Abbreviation: N.S., not significant.
