Performance at training on unrelated and related paired-associates in the 24 hour groups (24 hr am, “Delayed sleep”; 24 hr pm, “Immediate sleep”).

Note: Values are means with SEM in parentheses. Note that across all three experiments, training in the morning (Wake, 30 min am and 24 hr am groups) did not differ from training in the evening (Sleep, 30 min pm and 24 hr pm groups) on the number of trials it took to reach the 60% criterion or % correct responses on the final (i.e. criterion) training trial.