When Liz Sender’s daughter turned 8 in October, she requested a sleepover party.

So Ms. Sender, a makeup artist in Los Angeles, did what any modern parent does: She looked on Instagram at slumber-party photos. It was there that she spotted WonderTent Parties, which provides a professionalized sleepover experience.

Instead of mismatched sleeping bags cluttering a living room, the company suggests renting its individual pastel-colored tents stuffed with tiny mattresses, pillows and blankets, starting at $90 apiece. The tents are dotted with fairy lights, balloons and lanterns, and every child gets his or her own special space.

Completing the look is a fluffy, inviting white (white!) blanket placed in the center of the tents, where the young guests can gather to play games.

“They were exactly what my daughter wanted,” Ms. Sender said of her $600 investment for seven children.