If you did some optimizations by adding memory or RAM to processes, and the next morning, you find your server is no longer online: chances are it ran out of space and triggered the oom-killer.
oom-killer is a process that goes randomly killing processes to help the system survive.
After this occurs you should always restart as soon as possible.
Here is where you can find the logs in ubuntu, and how to identify if your system shutdown because of memory:
location of log: /var/log/messages (you will have to have super user permissions to view)
What you'll see: Just before the server shutdown or went erratic, this message:
apache2 invoked oom-killer
To get out of this situation, try to put more conservative memory settings on your applications, or add more RAM!
All the best!
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