It happens much more often than we'd like. But why? A couple of scientists have formulated theories about why you feel like you're falling and then suddenly wake up. Here's what they think is going on.

Business Insider is the fastest growing business news site in the US. Our mission: to tell you all you need to know about the big world around you. The BI Video team focuses on technology, strategy and science with an emphasis on unique storytelling and data that appeals to the next generation of leaders – the digital generation.