Sleep script for xfce desktop

#!/bin/bash

currentState=0
state1StartHour=4
state2StartHour=22

function set_sleep(){
        xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/blank-on-ac -s $1
        now=$(date +"%D %T")
        echo "set sleep $1 $now" >> ~/cron.log
}

function update_state(){
        currentHour=$(date +%-H)
        if [ $currentHour -ge $state1StartHour ] && [ $currentHour -lt $state2StartHour ]; then
                currentState=1
        else
                currentState=2
        fi
}

while true; do
        currentHour=$(date +%-H)
        currentMinute=$(date +%-M)
        waitHour=0
        waitTime=0
        update_state
        echo "Current state: $currentState"
        if [[ "$currentState" == "1" ]]; then
                echo "Executing disable sleep"
                set_sleep 0
                waitHour=$((state2StartHour - currentHour))
        else
                echo "Executing enable sleep"
                set_sleep 1
                waitHour=$((state1StartHour - currentHour))
        fi
        if [[ $waitHour -lt 0 ]]; then
                waitHour=$((waitHour + 24))
        fi
        waitTime=$((waitHour*3600 - currentMinute*60))
        echo "Waiting for $waitTime seconds until the next script execution."
        sleep $waitTime
done