Just sleep is a mod that changes the spawn point setting behaviour of beds.
When you first sleep in a bed your spawn point will be set to that bed (same as vanilla)
The changed mechanics can been seen when you go to sleep in another bed (for example at a friends base) your spawn point will not be updated. However you will be provided with the option to change your spawn point to that new bed.
If your spawn bed is broken or invalid the spawnpoint will be always updated to the bed you are sleeping in.
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This mod is open source and hosted on github. You can open issue with bugs or suggestions. If you would like to help out please make a PR to the github page.