Perfect mermaid waves are just a night's sleep away.
Take it from Jennifer Aniston's stylist Chris McMillan — you don't have to painstakingly craft beach waves with hot tools, potions, and your precious time. Instead, he suggests priming your hair with Living Proof Perfect Hair Day ($27) and dividing it into two sections along a center part (four if you have a thick mane). Then, twist the sections away from your face into a bun and pass out. When you let down your hair in the morning, you'll have effortlessly glossy, cascading waves.