From owner-freebsd-hackers@FreeBSD.ORG  Mon Sep 30 17:09:53 2013
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Date: Mon, 30 Sep 2013 19:09:44 +0200
From: Patrick Lamaiziere <patfbsd@davenulle.org>
To: Emre =?ISO-8859-1?Q?=C7amalan?= <mailist@yandex.com>
Subject: Re: cause of reboot
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Le Mon, 30 Sep 2013 17:24:18 +0300,
Emre Çamalan <mailist@yandex.com> a écrit :

> Hi,
> my server reboots every night and same o'clock last 10 days. But this
> machine's uptime was 96days.
> 
> Suddenly reboot this machine and now this continue every night again
> and again.
> 
> I didn't find any reason and I didn't change anything else.
> 
> I looked "last" command, 
> reboot ~ ~   AM 03.15  ~

The last time It happened (one month ago) to me it was the hard disk
(periodic scripts read a large part of the disk).

If the disk is smart capable try a full test with smartctl
(sysutils/smartmontools)

HTH, regards