How do I prevent smartphone from turning screen of (sleepmode)?

I have made a game like "doodle jump" where the user has to tilt the phone to the left or right to move the character. Now it is not required to touch the screen. So during the jump/play the phone will go in sleepmode after x seconds.

Workaround is the user has to touch the screen every x seconds. But! You can have an jetpack ingame so if you have one and your screen is trying to turn off and you hit the screen, you will activate the jetpack..

Does somebody has a solution for this or is there an option that I have left out in construct itself to prevent the phone going into sleepmode?

Thank you in advance.