Nighttime is when skin does its heavy lifting. Like the rest of the
body, skin does the bulk of its repairing, restoring, and regenerating
while we sleep, so night creams are focused on moisture and recovery.
They contain the most powerful, slow-absorbing moisturizers that are
designed to penetrate over the course of several hours; since there’s
little to no concern about sun exposure, they also contain the highest
concentrations of anti-aging compounds ingredients like retinol,
glycolic acid, and hyaluronic acid, which are able to do their work without interference from sunscreens.