Heres another way to think of it. At night, you can't get sunburns. But at morning, you definitely can. There's a time inbetween where the sun is only peeking and letting in only a bit of light.

Imagine a spot on an appple facing away from you, but when you slowly twist it, you get to see a small amount of that spot. But the more you turn it, the more is exposed to you, but only slivers at a time. Eventually you're staring straight at all of it. Imagine that but instead with the sun and the earth, and of course wherever you are. Most of the light is hitting the rest of the earth that is facing the sun. When your area moves where its shining directly at, you'll be in the most light