Russell Foster Professor of Circadian Neuroscience Oxford University .. pointed out the obvious .. in this interview .. http://www.abc.net.au/radionational/programs/bigideas/2018-09-12/10214912 .. that when you operate outside the hrs of your natural body clock cognitive performance drops and you are more prone to negative emotions and thoughts. In addition your health and general well-being takes a hit. In a 24 hr market how many traders place trades in the night hours after midnight? It would be interesting to see performance per hr of day in local time (if possible?). Do trades placed at 9am outperform those placed at 3am. This could be a simple way to filter trader performance.