There's a bit of feeling sneaky and alien-spy-technology about it. :)
There's also a lot more focus on the hunt and the target: most of the stimuli you have during the day that provides camo, noises, colors, or distraction is removed, and it's just you, a black sky, and the white-hot thermal shapes moving through the high grass towards the killzone.
You're not distracted by the normal, daytime stuff and color variety going on. It's hyper-focused TV screen views, just you and the target through the green (or black-and-white) tube.