Figure 6. Correlation of electroencephalographic (EEG) sleep times (time to peak activation and peak reactivation and their difference) to behavioral sleep times (time to loss and return of righting reflex and their difference). The time to loss and return of righting reflex were monitored to calculate behavioral sleep time (study 1). Time to peak EEG activation and reactivation were compared with behavioral measures. (A) 6.25 mg [center dot] min sup -1 [center dot] kg sup -1 propofol in emulsion formulation. (B) 6.25 mg [center dot] min sup -1 [center dot] kg sup -1 propofol in lipid-free formulation. (C) 10 mg [center dot] min sup -1 [center dot] kg sup -1 propofol in lipid-free formulation.