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Number of lapses (A) and response speed (B) in the psychomotor vigilance test for extended (filled circle) and habitual (open circles) sleep conditions. *Significantly different between habitual (HAB) and extended (EXT) (*P < 0.05 **P < 0.01 ***P < 0.001). aSignificantly different from BASE at 09:30 in habitual (P < 0.05). bSignificantly different from BASE at 09:30 in extended (P < 0.05). BASE, baseline; TSD, total sleep deprivation; REC, recovery; RT, reaction time.
