The amount of sleep you get can affect your performance.
Here is a trader with a strength when he sleeps over 7 hours the night before he trades, and a weakness when he sleeps less than 6 hours.
It's recommended that the average adult gets 7-9 hours a sleep a night, but each individual is unique, and knowing which amount of sleep is optimal for your performance is an extra edge you can add to your trading repertoire.
See how your sleep affects your performance. You may think going to sleep at 12am and then getting up at 5am to read the news and adequately plan for your trading day is benefiting you, but it could actually be hurting your P&L. You could also be a trader who does his best trading on only a couple hours rest. It is important to know where your strengths and weaknesses lie, so you can replicate the nights sleep that works best for your trading.