This pack allows users to opt-out of sleeping so that other players can skip the night. Players who are experiencing insomnia (as well as offline players, and players in non-overworld dimensions) are not counted towards the list of players that need to sleep to be able to skip the night.
To enable or disable insomnia, enter your bed and click either [Enable] or [Disable]. You can check if you have insomnia enabled by looking for your name in the list of players that are experiencing insomnia.