because it's nearly christmas and i think some people sell/exchange his/her bitcoins to use it in christmas.
What do you think guys?
Following your reasoning cannot be a jump but a decrease. Normally people make gifts for the Christmas but the kind of gifts that are made for this kind of celebration (as it is even for the most of the other ones) cannot be bought with bitcoin but with normal fiat money. So who want to buy something and prefer to use its bitcoins for this gift and not its normal money, first will try to find something to buy with bitcoin and I doubt that will be able to find something desired and special in some store which accept bitcoin. Probably will find it in other stores that will not accept (or even know) it. So will have two choices: to sell its bitcoins in order to have fiat money and buy the wanted gift or to continue its journey until will find some store which satisfy both its desires. To use bitcoin and to find the wanted gift. I think that the second choice it is hard to be verified in mass. So most of bitcoiners will sell their bitcoins. In this way the supply of bitcoin in the market will be increased and the price will be lowered.