Figure 1. Comparisons of ventilation ( ${\dot{V}}_{\mathrm{E}}$ ) between spontaneously hypertensive rats (SHRs) and age‐matched Wistar–Kyoto (WKY) rats at young and adult ages in wakefulness, non‐rapid eye movement (NREM) and rapid eye movement (REM) sleep .

Data are shown as absolute values (means + SEM). Abbreviations: Almxt, almorexant; and RA, room air. ^*Values are significantly different in hypercapnia with Holm–Sidak or Student–Newman–Keuls post hoc test (P < 0.05).