Day V Evening Racing..

[PeterLe]

Hi
I was recently looking through my results over the last month and noticed something strange..
I keep fairly details notes and noticed that courses that tend to have a positive P&L during the day time do less better when it is an evening event. (One very noticeable course (but not unique) is Wolv)
I am using auto trading, so I am doing nothing different and the style is exactly the same..

I was wondering whether it may be due to perhaps the event not being broadcast...or even a different type of punter in the evening...vols traded ?
I dont have enough data to draw any conclusions, but would welcome any thoughts??

Thanks
Peter