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Schematic overview of the study design. AX-CPT, AX-continuous performance test; RT, reaction time test; VTS, Vienna Test System; SRSS, Short Recovery and Stress Scale; VAS, Visual Analog Scale; SW, SOMNOwatch plus EEG; MC, manipulation check; PN, powernap; SB, systematic breathing; SB+, systematic breathing plus mental imagery; CC, control condition.
