Some people may prefer to use the keyboard to wake up a PC, which is convenient too.
If your computer wakes up at the exact same time, check your time setting:
Personally I think this can be a very useful feature, especially if correct time is important in whatever you’re doing. But for most people it probably doesn’t matter.Disk Defragmentation Schedule
Scheduled disk defragmentation can wake up a computer in sleep mode as well. To turn it off, or change the schedule:
Apparently Vista is configured to enable a feature called “Wake-on-LAN.” It automatically wakes up to check network status or when there is network traffic. To disable WOL, follow these steps:
Note that if you prefer to use this feature, for remote access, for example, you may have to experiment with your Bios settings and jumper configuration to allow WOL and in the mean time, fix the random waking up problem.
@dendelion14, You saved me much research. Thank you. The media sharing keeps the computer from sleeping if turned on. Once I turned it off it went right to sleep .
I am surprised that media sharing would keep the computer awake. Maybe there is a power setting or something to disable it from keeping the computer awake.
dendelion14, do you have network sharing enabled on your machine? I had a similar problem with my machine since I moved and bought an Xbox360 that I comingle with my shares on my computer. What I discovered, via searching the net quite a bit, is that if you have sharing, more specfically media shareing enabled, the system will not go to sleep. I had to go into power management, select my choice, then click on advanced setting. Under advanced settings, you first have to click that button that allows you to make changes. Once you do that scroll through the options. Near the bottom of the list is one related to media sharing, "do not sleep while sharing" or something (sorry, I'm at work on an XP box, not Vista at the moment). Under that final box you can change the selection to enable the computer to sleep. Give this a try, it worked for me. If it's confusing let me know, when I'm home tonight I can look up the specfic information you would need.This.... ive had issues with my computer not sleeping lately... it seems to happen randomly. Sometimes it seems to be due to me watching a video on a website, then later on notice my computer is not going to sleep (even after i have closed the website), only to have it hybernate after a reboot. And ive also had it simply flat-refuse to hybernate after a reboot in which the computer is not touched at all. Seems to be fairly random when it decides not to hybernate, but i am trying out this tip (as mine was set to 'do not allow to hybernate while sharing') to see if it works.