hibernate-reboot.sh

#!/bin/bash
sleep_cfg=/etc/systemd/sleep.conf.d/hibernate-reboot.conf
cleanup_cfg=/usr/lib/systemd/system-sleep/hibernate-reboot.sh

sudo mkdir -p "$(dirname "$sleep_cfg")" "$(dirname "$cleanup_cfg")"

sudo tee "$sleep_cfg" << ''
[Sleep]
HibernateMode=reboot

<<< '#!/bin/bash
case "$1" in
        pre)    echo "[hibernate-reboot] Going to reboot after hibernation"
                ;;
        post)   rm "'"$sleep_cfg"'" "'"$cleanup_cfg"'" || true
                ;;
        *)      exit 1
                ;;
esac
' sudo tee "$cleanup_cfg" && sudo chmod +x "$cleanup_cfg"

systemctl hibernate