Please choose the correct ending to complete the given sentence: Health: [header] How to use pink noise for sleep [title] Play the sound of rain falling. [step] If you can find a recording online of rain falling, this can be a great source of pink noise. The sound of rainfall is one of the most soothing forms of pink noise available.

Ending1: It can be thought of as just a background noise, so it might not be affecting your sleep. Additionally, water from a hose, a breeze, or even the wind can disrupt your natural rhythm. Ending2: You can upload videos and use your phone, radio, mp3 player, desktop computer or other devices to create as many pink noise with the media as possible. [substeps] If possible, make sure the effect is very minimal. Ending3: The sound of rainfall mimics a brook rushing down a river. [substeps] Make sure the source of the rainfall is familiar, such as a particular river. Ending4: [substeps] You may be able to find youtube videos that play the sound of rainfall for hours. You can also find tracks that play rainfall on a loop.

Answer format: ending1/ending2/ending3/ending4