system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: time - How do we "travel" through time?

My actual 5 year old asked me this weekend "How do we move through time" and it got me thinking... do we fall through the time dimension like we do through space via gravity? Gravity, to my understanding, is a result of the Higgs creating the property of matter we interpret as mass, and bends spacial dimensions such that we fall to a lower energy state - is there some similarity there with time such that we fall through that dimension as well? If so is there any theory as to what creates that one way flow? As I thought about it all I could imagine was some kind of odd (time, not mass) singularity that forces the flow of time in one direction. Is there possibly some Higgs like particle that creates this field?
gpt
Richard Muller's recent book "Now: The Physics of Time" is a great read that may provide you with fodder to appease your kid. 

Basically, his hypothesis is that the reason time flows from past to future is because of its necessary connection to space in the form of space-time. Because new space is being constantly being created, new time is also being created as well, because it is impossible to uncouple space and time. They are just one thing, space-time. The creation of new time, the hypothesis goes, is experienced as the flow of time toward the future. 

Hope that helps.