http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspxPOWERCFG has the answer to that question and many others, like -LASTWAKE will tell you why your machine resumed form sleep or hibernate. I used to run into an issue where I'd wake up in the morning and find my laptop was at perfect temperature to cooken-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspx#3336665Tue, 08 Jun 2010 10:20:30 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3336665Computer Support Kingston<p>give the microsoft support site a try</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3336665" width="1" height="1">http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspx#3336184Mon, 07 Jun 2010 05:47:10 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3336184Alex S<p>Thanks for giving use of LASTWAKE and other information... Sacatech</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3336184" width="1" height="1">http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspx#3078267Thu, 26 Jun 2008 07:44:46 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3078267Little Miss Enviro Geek<p>There is a tonne of information available on Vista power management, from whitepapers to videos to blog</p> <img src="http://blogs.technet.com/aggbug.aspx?PostID=3078267" width="1" height="1">http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspx#2907045Mon, 18 Feb 2008 19:18:42 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:2907045BooRadely<p>Think it's only for Vista.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=2907045" width="1" height="1">http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspx#2896947Sat, 16 Feb 2008 03:18:35 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:2896947Wizou<p>Do you know a way to access the same information as powercfg -lastwake on XP SP2 whose powercfg doesn't seem to have this feature ?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=2896947" width="1" height="1">http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspx#797297Fri, 20 Apr 2007 19:30:48 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:797297BooRadely<p>It depends on your hardware at this time, I'll update this post with the new info.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=797297" width="1" height="1">http://blogs.technet.com/b/brad_rutkowski/archive/2007/04/18/what-variations-of-sleep-does-my-computer-support-and-why-did-it-wake-up.aspx#793120Fri, 20 Apr 2007 00:00:39 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:793120David Moisan<p>Not that &quot;Wake History[0]&quot; is really descriptive. &nbsp;How did you use that information to determine why your laptop was waking?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=793120" width="1" height="1">