Stop Mobile screens turning off

How do I stop the screen turning off on an android. I can stop the screen going dim but not to stop turning it off. My game uses the accelerometer.

Thanks

You should use:

Screen.sleepTimeout = SleepTimeout.NeverSleep;

this script does both

iPhoneSettings.screenCanDarken = false;

The iPhoneSettings.screenCanDarken is deprecated - it’s now

Screen.sleepTimeout = 0f;

0 is never darken, other values in seconds - docs here

My Asus ignoring or forget sigle command and stoutly get screen twice darker after a minute.
In some little expeiments ive got a solution:

	Screen.sleepTimeout = (int)0f;
	Screen.sleepTimeout = SleepTimeout.NeverSleep;

in void Update () section, somehow wakes it nonsop.

// Prevent screen dimming.
public const int NeverSleep = -1;
//

    //     Set the sleep timeout to whatever the user has specified in the system settings.
    public const int SystemSetting = -2;

I found this on source code so if you want make it never sleep you should use -1 instead of 0
and -2 for system default value if you changed it to any different value.
But I recomend
Screen.sleepTimeout = SleepTimeout.NeverSleep; as Macarse said. You can hover over neverSleep to see -1 value by yourself .
Just wanted to make it clear 0 is not the true answer for never sleep it is -1

@Macarse I am using
Screen.sleepTimeout = SleepTimeout.NeverSleep;
but Not being able to prevent device sleep in Webgl Mobile platform.
is there some other way for this or am I missing something.
Please help me out.