Veyon is a free and open source software for monitoring and controlling computers across multiple platforms. Veyon supports you in teaching in digital learning environments, performing virtual trainings or giving remote support.
When I use veyon to demo my screen to my students, I found out the students can use Ctrl+Alt+Del or Alt+F4 to interrupt and terminate the demo session and regain control of their own devices.
Never mind, a reboot after the Veyon installation resolves it.
But I still want the wake lock though.