Bukkit

From v3.0.1:

As the previous release was a big one, some new bugs were introduced. Luckily, I got your back and took care of them.

• The Spanish translation was improved drastically and no longer causes an error (if you're using the default Spanish translation, make sure to delete your current file to generate the new version)
• BetterSleeping will warn the console in a clean manner when there is an error while sending a message. A stacktrace is no longer printed to the console
• doDayNightCycle set to false at times [0, 10] no longer causes spam in the chat
• Storm skipping causing some weird behavior has been fixed entirely
• Removed Freddy Krueger

Some issues may still be remaining but make sure to report them so they can be fixed.
Happy sleeping!

From v3.0.0:

• Almost every line of code was rewritten, and new concepts are being used to more accurately track the sleeping players.
• Time can pass faster, depending on the number of players that are sleeping. Or you can have the time be set to day, as you are used to.
• Required players can be counted in different ways now: by percentage or an absolute number.
• Localisation was added: English, Dutch, Portuguese and Spanish are now supported by default. Adding your own lang file is still possible as well!
• The singular/plural system of lang.yml is now more advanced.
• Debuffs were introduced to punish players that didn't sleep
• And finally, bypassed players can now sleep!!
• bStats is now being (optionally) used to collect some anonymous info
• The core systems have been changed to be way more robust than ever before

That should cover most changes from your perspective but it's very likely I forgot some features. Make sure to check the plugin page as it has gotten a completely fresh look for v3.

Cheers, guys and girls!