Weird - unable to extend error

Oracle
8.0.5.0.0
Tru64
4.0f
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Got in this morning
(duh duh duh duh)
and found a mail
from my alerting script from the DB with the following
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ORA-1652: unable to
extend temp segment by 27309 in tablespace  SYSTEM
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As far as I am aware
there was absolutely nothing going on on this system and indeed was the first entry in the alert log file for about 2 hours. (Normal operations on this DB stop at about 18:00 - the message appeared at 20:20.).
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Should I be worried
?? There have been no entries in the alert log since. (saying that though, people don't start using it until about 9am). Lee Robertson <FONT color=#0000ff
face=Arial>Acxiom Tel:
   0191 525 7344 Fax:
   0191 525 7007 Email:
lerobe_at_acxiom.co.uk
 

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