Now we will position the first of our three EEG electrodes which will measure brain electrical activity overnight.

Take another of the gold-cup electrodes and prepare it in the same manner as the others so far.

Tape the electrode down to the prepared area just below the hairline on the top left of the participant's forehead, with the tape and the wire running diagonally down along the temple.

Insert the plug into the F3 port (the 4th input in from the front left of the headbox).