Table 2. Sleepiness values in both conditions.

	Encoding	Memory test
No Nap-group	2.1±0.6	2.6±1.2
Nap-group	2.7±1.3	1.8±0.7

Stanford Sleepiness Scale values (mean ± SD) at the time of list encoding (12:00 hr) and the recognition memory test (18:00 hr).