 - The 10-10 International system of electrode placement will be used for the scalp EEG recordings with a multichannel high sampling rate amplifier 2 KHz. This will provide standard 1020 electrode positions F3, F4, F7, F8, C3, C4, Fz, Cz, T3, T4, T5, T6, P3, P4, O1, O2, and Oz electrodes which will be initially used to detect the more significant spatiotemporal measurementsphenomena while offering the opportunity to elaborate on the spatial and frequency resolution of our findings at a later stage. Peri-ocular EOG electrode data will also be recorded to detect eye movement related slow wave activity. Investigators will therefore be able to avoid spurious estimates of slow wave activity in the anterior EEG regions. 