What does it mean that fans contribute to sleep?

Fans' sleep-aiding means that fans contribute sleep-aiding content to their favorite idols or online celebrities. Sleep-aiding content refers to music, sounds and stories that can help people relax and fall asleep. Fans will make all kinds of audio, video or text to help sleep, and submit them to idols or online celebrities, hoping that they can share them with more people and let more people benefit from the content to help sleep.