Catalase: CAT, disc over water: DOW, electroencephalogram: EEG, glutathione: GSH, oxidized glutathione: GSSG, glutathione peroxidase: GPx, grid over water: GOW, hours: hrs, multiple small platforms: MSP, nitric oxide: NO, paradoxical sleep deprivation: PSD, superoxide dismutase: SOD, total sleep deprivation: TSD, ↓: significantly reduced, ↑: significantly increased, —: not significantly increased or decreased, and ↑↑: significantly increased compared with a control and between sleep deprivation times.