Do Not Sleep will keep the screen of the device on, as long as its service is running. If the app fails to prevent your sleep to fall asleep, the app can selected to use an alternative method, which changes the display timeout. The methods can be toggled via the app's menu. Successfully tested on devices of the following brands, without alternative method: - OnePlus - Xiaomi - Huawei The use of this app will cause a high battery drain... Use with caution! A simple, yet effective app!