I don't think there always has to be a reason, there doesn't have to be something in the news that the markets are responding to. Often movements are just because sell or buy pressure has been exhausted. You can't see the pressure building up just in dollar prices on CMC as these remain unchanged - all that you see on CMC is when the floodgates open and the price rockets up or plunges down. You have to actually look on exchanges to see buy and sell walls getting eroded down.
When we talk of factors that usually affect the value off bitcoin, we should know that the factor cannot be in a particular location, it could spread round the whole continent which we may not even have a clue to what it is if where the factor came from exactly does not create a news for it.
My country is not a popular country, and imagine that something happen that made bitcoin shoot up in my country, maybe a particular billionaire decide to move his money to another location through bitcoin, and will do it through exchanges which we may all not get to know if nobody announces it, so I see all these stress of having to look for the factors responsible as something that is really not necessary, because not all factors will be made known except the ones that are coming from very popular region.