Spike in Website Sessions

Something I've noticed that I can't explain. I like to use analytics to track activity on my website. I used both the Google Analytics website, to track in real time, and the AliDropship Dashboard for an overview each day. As one would expect, there's a natural fluctuation between the amount of visitors to the site from one day to the next. However, every once in a while, I'll get a spike that goes way up! My sight is not that old, so I would say I get between 20 to 50 visitors per day at the moment. Every so often, I'll get a spike to 150, or maybe even 250. One time, it went all the way over 2000 on a single day before coming down again the next day to more normal levels.

Spike.png

Does anybody know what causes this? I can't imagine that 150 people just decided to visit the site out of the blue?
 
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