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I never want my Android tablet to go to sleep, can I prevent sleep mode?

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Depending on you tablet, you may have the option to set the screen timeout to "never" under Settings > Display > Sleep.

If you do not have this option, you can enable Settings > Developer options > Stay awake. This will keep your tablet awake while it is charging. This could be useful if your tablet does not support the "never" screen timeout.

Note: If you don't see Developer options in Settings, it may be made available by going to to Settings > About > Build number. Developer options should appear after tapping the build number several times.

(Rowan) Note: Developer settings isn't always in build number it can be in others such as the kernel version. It's mostly trying to be hidden by the devs in different locations and I know this because I myself have found them in different locations on different devices.

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    Settings > Developer options > Stay awake worked for me
    – Ced
    Apr 20 '20 at 19:10
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There is a stay awake option while charging. For the older Android Froyo 2.2, it can be found under:

Settings > Applications > Development > Stay awake

"Screen will never sleep while charging."

The same option is still present up to the current 8.1 version, but you first have to unlock developer options.

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You can probably prevent you tablet from sleeping using an automation app like Tasker (paid) or Automate (free).

Here’s a automation “flow” for Automate to keep the screen and CPU awake, but you can easily modify it to only keep the CPU awake: http://llamalab.com/automate/community/flows/374

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I use the app Caffeine, and it works very good. It's free, and highly helpful. It's very small also (few kb).

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