Static builds up on our bodies as the materials of our clothes separate from chair seats and floor coverings - we're generally not aware of it but it's nearly always there - I have heard it said that you will not notice a static discharge below about 5,000V.
In the summer the warm air can hold much more moisture so less static is generated and it discharges easier - in the winter when the air is naturally more dry static builds up and is more noticeable.
Leather soles on shoes and slippers will help as will spraying carpets with a mild solution of water and washing up liquid.
Man made fibres on furniture, clothes and flooring coupled with dry air all contribute to your static problem.
http://en.wikipedia.org/wiki/Static_electricity#Removal_and_prevention_of_static_electricity
Good luck...
Peccavi
January 2010