Comment by teddyh

If you want to be able to reboot remotely, and non-interactively (i.e. while you sleep), I (and one other person) created Mandos for this purpose: <https://www.recompile.se/mandos>. It gets the password over the network. If this seems insecure to you, read the FAQ: <https://www.recompile.se/mandos/man/intro.8mandos>

Mandos works with initramfs images created by both initramfs-tools and Dracut, and is present in Debian since 2011, so no need to use a third-party package.