Table 3. Mean error rates as a function of transition (12 hr. group).

Transition	Pre-sleep error rate (errors / trial)	Post-sleep error rate (errors / trial)	% improvement
Most accurate	0.58	0.40	31.2
	0.92	0.67	27.3
	1.43	0.92	35.5
Least accurate	1.87	1.30	30.3