Find a way to enable and disable in an automatic way

#!/bin/bash
while :;
do
clear
echo "Saoron goes to sleep"
printf '1\n' | ./stop-sauron.sh
echo "Saouron will rise in 55 minutes"
sleep 3300
printf '2\n' | ./stop-sauron.sh
echo "Saoron is awake"
sleep 300
done