安眠ひざまくら is an Android application developed by HYDROGEN STUDIO. It falls under the Lifestyle category and is compatible with Android 9.0 or later. This free application aims to provide a relaxing experience to help users fall asleep.

The application offers four different modes: "listen to me" mode where the app responds to the user's words with a single phrase, "lullaby" mode where a gentle voice sings to the user, "storytelling" mode where users can listen to old tales and "ear cleaning" mode where users can experience a sensation of getting their ears cleaned. The latter two modes are in 3D audio and require headphones for the full effect. The app also features a girl who returns the user's words, making them feel like they are talking to someone while using the app.

Overall,安眠ひざまくら is a unique application that aims to help users relax and fall asleep using different modes.