How do some people speed without fear?

This usually happens only at night, but when I’m on the Interstate, there are multiple cars, or just one going 110–115MPH.

In my opinion, it’s easier to speed during the day because you can at least see where the cops are ahead of time, but at night they can be anywhere, so risking going so fast seems like it’s not worth it.

I was under the impression cops patrolled 24/7. Do these people speeding at 3AM have some secret that I don’t? Do police go to minimal manning during the middle of night?

I want to know the secrets!