No More Sleeping disables sleeping. There is a single configuration option which controls how sleeping is disabled. As this is a server-side configuration option, you can find it in your world's config folder. - If the configuration option is set to false (default), right-clicking a bed will immediately change the time to day. That means that the player will not be sleeping and will not have to wait until the time changes. For servers, this means that only one player needs to right-click a bed in order to pass the night. Do note, that the usual restrictions apply. For instance, if there is a monster near the bed, you are not able to pass the night. - If the configuration option is set to true, then sleeping will be completely disabled and beds cannot be used for passing the night.
Here's a video demonstrating the config value set to false:
Here's a video demonstrating the config value set to true: