Table 2. Changes in KSS scores over time (n=27).

	Mean±SD	F	Bonferroni
16:00 (1)	3.30±0.27	29.54***	5>3=4=6>1; 5>3=4>2
18:00 (2)	3.74±0.23
20:00 (3)	5.33±0.28
22:00 (4)	6.11±0.36
24:00 (5)	7.15±0.33
07:00 (6)	4.78±0.30

***p<0.001.

KSS, Karolinska Sleepiness Scale; SD, standard deviation.