Fig. 4.
Mean basal plasma corticosteroid concentrations during sleep deprivation and sleep recovery. Results from yoked (shaded bars) or sleep-deprived groups (solid bars) were not statistically different from baseline controls (n = 6, open bar) until the recovery period of 48 h of sleep ad libitum after 10 days of partial or total sleep deprivation. Values are expressed as means ± SE, n = 6 per group except sleep-deprived rats studied on day 10, for which there were 5 specimens. P < .016 for the comparison with †day 5 and ¶day 10 of the same group. P < .001 for the comparison with **baseline control and §day 10 of the same group.