Sleep MacBook when a bluetooth device turned off

bluewatch.sh

#!/bin/bash

bluetooth-device-is-connected() {
    system_profiler SPBluetoothDataType \
      | grep $1 -A 10 \
      | awk '/Connected/ { print $2 }' \
      | head \
      | grep -q Yes
}

interval=5
address=xx-xx-xx-xx-xx-xx
onturnoff="osascript -e 'tell app \"Finder\" to sleep'"

connected=1
while true; do
    bluetooth-device-is-connected $address
    current=$?
    if [ $connected -eq 0 -a $current -ne 0 ]; then
        sh -c "$onturnoff"
    fi
    connected=$current
    sleep $interval
done