I think here only two reasons due to that the Bitcoin is in trending in many places ( offline as well as in online ) .
First reason is that announcement of the legalisation of the Bitcoin in Japan and that results into the numbers of the exchange sites and services with the Bitcoin related .
Second reason is of the news about the legalisation of the Bitcoin in India , The government of India is looking to legalisation the Bitcoin or they can ban it , but due to the example of the Bitcoin legalese declared in Japan , people expects that 99% chance is to legalise , so more and.more people are buying , so that they can make profit after the increase in the price after the legalisation of the Bitcoin in India .
Here is myself bought 0.1btc and hoping that will make profit into double