Hais.You could see on your crontab or at jobs if there's anything down there, also make sure you don't have any application running like monit which can restart mysql.
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Begin forwarded message:
From: Abraham <email@example.com>
Date: 5 de mayo de 2011 17:38:09 GMT+02:00
Subject: MySQL Server Rebooting Automatically?
Does anyone know why a MySQL Server would be automatically rebooting at midnight? I never set it to reboot and can't find an option to change this. I've also searched online and can't find an answer. Any ideas?