Amazon Fire Stick - disabling automatic sleep setting

[Android Central Question]

Hi, I would like to use my Fire Stick to listen to a radio station - specifically, the LBC station via the LBC app. There are two issues - the app freezes when the screensaver kicks in, but then if I disable the screensaver (set to "Never"), the whole FireStick just goes to sleep after 20 minutes. Is there any way I can disable the auto-sleep mode.

Thanks.