Not sleeping will keep the device screen on as long as its service is running.
If the app fails to prevent your sleep from falling asleep, the app may choose to use an alternate method, which changes the display timeout. Methods can be toggled through the app menu.
Supported Android
{4.4 and UP}
Supported Android Version:-
KitKat (4.4–4.4.4)- Lollipop (5.0–5.0.2) – Marshmallow (6.0 – 6.0.1) – Nougat (7.0 – 7.1.1) – Oreo (8.0-8.1) – Pie (9.0)