If you're looking to Download Sleep Mode. on your Chromebook laptop Then read the following guideline.

Get ready to drift off with Sleep Mode's ambient sleep sounds. Experience the perfect combination of soothing melodies and calming soundscapes to help you relax and get a restful night's sleep. This app includes the sound of soothing thunderstorm, the sound of a beach waves crashing on the shore, and a volcano erupting. Each sound can be changed by clicking on a star that lines the bottom of the app. The timer can be set by pressing the star in the top right corner. The sounds have been mixed to give you the perfect soundtrack to lull you into a deep and restful sleep.