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Average bout duration (BD) during W, NR and REM in young and old rats. Panel A: WBD in young rats. Panel B: WBD in old rats. Panel C: NRBD in young rats. Panel D: NRBD in old rats. Panel E: RBD in young rats. Panel F: RBD in old rats. + = p<0.05 for 10 μg Hcrt-1 relative to vehicle; * = p<0.05 for 30 μg Hcrt-1 relative to vehicle.
