Vista goes off line while sleeping

I am using Vista Home Premiam,64 bit. When I leave my computer and when I manully put it to sleep, sometimes I can't get it out of sleep and when I do get it awake,it is off line. When I can't get it to wake, I finally have to manully shut down the PC and when it comes back on, it is in Safe Mode and I must re boot. Sometimes, I can't get it to sleep.
It looks like it is asleep, but wakes up in just a few seconds.
Would appreciate any help someone could give me. Thanks in advance,
Red

 

Thanks for your input. I, too, shut down at night, but my problem occurs when I leave my PC and it goes to sleep or if I put it to sleep before I leave it for a period of thme. I not much at tech stuff so I don't mess with the technical things. I'll be upgrading to Windows 7 when it ships in Oct. Maybe I"ll get things straightened out then. Thanks again for your input.
Red

 

Vista has been plagued with countless bugs related to shut down/reboot/sleep functions and the amount of reported causes and fixes is pretty shocking.
[note: i could have ended that sentence at "Vista has been plagued with countless bugs" and it would have been just as valid

My main computer is in peices at the minute so my bookmarks are hours away from being any use to anyone but when i get it up and running i've got some links to some of the most common prob's and fixes regarding this type of bug.

On the off-topicish subject of computers being on 24/7...

My laptops are shut down whenever not being used but my desktops are always on unless ther broken or being cleaned.

Q

 

Thanks for the replys to my problem.
Yes, most of the time, I must shut down and reboot. I sure hope that Windows 7 is a lot better than Vista. If not, what do we do? Maybe go back to XP. I had few complaints with XP. Thanks Guy
Red

 

I am using Vista Business ,64 bit for 3 years now i have set all powersetting never to turn of and i do but my network(card) to weak up did had no problems on my end with vista to go to sleep check your power setting and post it hier

 

Here ryder, take a look at these.....

http://support.microsoft.com/kb/929734/en-us

http://support.microsoft.com/kb/928135/en-us

 

Hey bro do you mean coma mode i just get up and walk away 5 mins later my puter goes to coma mode. When i return even if it were 24 hours since it went into coma mod touch any key or my mouse it pops right back on