I think it's just shark because to be honest who wants to play on a Sunday? It's a religious day! The religion of being hungover.
it is also the day the ladies play and most clubs cannot afford too have two sets of facilities so we know who will and dose miss out.
at least the u17 (they don't drink) play in the morning so this is no big issue with them but a clubs first team always gets the top time and park.