I am running some scripts and they are faulty terrible scripts, So they make the computer run slow. I wanted to restart the OS X computer every night to just refresh what they did. I was having troubles with this and finally just sat down and troubleshooted it.

In Terminal:

sudo crontab -e

In Crontab, And enter this and change the time to when you want to restart OS X:

10 0 * * * /sbin/shutdown -r now

The above code will restart the computer at 00:10 every day (morning)

Hopefully this will help others as it has helped me.