Insomniac

A small simple mod which disables the sleep functionality.

You can configure if you want the bed to still set the spawn or not.

Includes configurable messages for both denied sleep & set spawnpoint. (1.12 and earlier)

Possible to configure which time of day players should be allowed to set spawn. (1.12 and earlier)

Can also be used to set spawn during the day and sleep through the night. (1.12 and earlier in vanilla for 1.16)

For 1.16.5 - Able to sleep on nights with phantom spawns or disable phantoms all-together.
More details in the configs.

I've looked through a couple of suggestions
So far 2 ways to deal with Phantoms and not being able to sleep have been added
Feel free to suggest other options and I'll try to be a little better at updating/adding things :)