In this update I added a small GUI so you can customise your settings ingame without needing to open the config. with the command
/sleepmenu
you can open the GUI.

There you can change if there will be a chatmessage which players are sleeping. It says if the chatmessages are activated or deactivated.

You can also change the language of the plugin (keep in mind to reload or restart the server after changing the language).

Another great feature of the gui is that you can change the delay bewteen going in the bed and waking up. if you click on the clock in the gui you will get to another inventory where you can change the delay.

Every change you make will also be saved in the config.
The permission to open this menu is sleepmenu.own