We know we advised against lots o' shimmer earlier, but at night, (almost) anything goes. Guilis says that you can amp up the shimmer in the darker hours. But remember: The point of highlighter is to mimic light hitting your face in a flattering way, so put highlighter on the parts of your face that would naturally receive the most light, such as your cheeks, nose and brow. If you have a feature that you don't want to emphasize (like a prominent nose), avoid putting anything gleam-y there. Bonus tip: Apply highlighter to your eyelids at night. Guilis promises this will give you a glow you just can't get during the day.