In addition to lack of sleep, drinking too much alcohol and caffeine can cause blood vessels to dilate, resulting in dark circles.
To brighten your eyes back up, start by dabbing on an eye cream that contains anti-inflammatory algae extracts, says LeAnn Rimes' L.A. dermatologist, Rebecca Giles. Try Nip + Fab Dark Circle Fix Triple Action Eye Cream ($16, target.com).
Then, camouflage circles by layering a yellow concealer under one that matches your skin tone, says Michelle Williams' L.A.-based makeup pro Nick Barose. Try Jemma Kidd Mannequin Skin Perfector Kit ($22, target.com).
For a really wide-awake look, apply a shimmery champagne eye shadow in your inner corners, curl lashes and swipe on navy mascara (which makes eyes appear whiter).