Twilight

It's that time of the day where it's the transition between dark and light. The inbetween time.
Experts from unheard of places say it's the most dangerous time to drive a car. The sun is setting and darkness is coming. Many times one can't tell where the horizon ends and the road in front begins. There's a shadow over everything.
Drivers don't know if they should turn on the headlights, staring into the setting sun, or brave the dying glow from a rearview mirror.
The fading light will blind and the night vision hasn't had time to adjust. Because one way or another, we need the light. Whether it's natural or artificial. That's what makes twilight so hard.
The inbetween makes the pain.
Always darkest before the dawn, I suppose. When we can either turn on the lights or don the shades.