string: Sleep EEG (derivations C3A2, C4A1, O1A2, and O2A1; International 10–20 System [28]), electromyogram (EMG), and electrooculogram (EOG) were recorded (128Hz sampling rate at 2 Y; 256Hz sampling rate at 3 Y and 5Y) during one night of sleep at each time point (2 Y, 3 Y, and 5Y) after 13-h of prior wakefulness (Vitaport 3 EEG recorder; Temec Instruments).