Melatonin

A hormone that regulates your sleep wake cycle. Your skin actually does a lot of its repair work at night — repairing, renewing and restoring while you rest — so quality sleep isn't just for energy, it's literally skin care.

Blue light from devices in the evening can suppress melatonin production making it harder to fall asleep and cutting into that all important skin recovery time. Another reason your night routine matters more than you think.