To play brown noise on Alexa all night for better sleep, follow these steps. First, ensure your Alexa device is connected to Wi-Fi. Second, enable the Sleep Sounds skill by saying, “Alexa, enable Sleep Sounds.” Once enabled, say, “Alexa, play brown noise.” To ensure it plays all night, set a sleep timer by saying, “Alexa, set a sleep timer for 8 hours.” Brown noise can help mask disruptive sounds, promoting deeper sleep. Remember to keep your device plugged in and at a safe distance from your bed to avoid any hazards while ensuring optimal sound quality.