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When you’re downloading you probably don’t want your computer falling asleep - this idea (this is something that’s been on ‘the list’ for a while too) discusses the possibility of preventing this from happening.
On Windows there is a new configuration option:

to control this. There are two levels of control - firstly you can prevent complete while a download is in process. Secondly you can prevent sleep while you have seeding downloads that meet the ‘first priority’ criteria ( see the wiki for details )
As always report issues via our forums or drop into our IRC channel #azureus on chat.freenode.net (or use their webchat)