In reply to Marc C: i generally find my climbing to be inversely proportional to the amount of alcohol i drank the night before - does that help?
but having said that a weekend climbing will generally produce better results on the sat as the fingertips aren't shredded..
However, also a break (be it winter or a month off) will generally require a couple of sessions to get the head back in...
is that's vaguely along the lines required,, i'm feeling totally not with it...