Macbook Pro Unibody 2008 sleep issue

I have a Macbook Pro Unibody 2008 and I have noticed an issue when closing the lid and putting the computer to sleep. Sometimes it will go to sleep successfully but some other times it won't. If it fails to go to sleep the fans kick in after a while and the computer becomes unresponsive, it won't wake up again and I have to turn it off by pressing the power button for a few seconds. When I turn it on again it shows the white screen without the apple for a while, then restarts by itself once more and then shows the apple and boots normally. Upgrading to Lion from Snow Leopard did not make any difference.
The worst part about this issue is that sometimes I won't notice the computer hasn't gone to sleep and I will put it in my carrying bag to go somewhere and when I open the bag again I find that the fans are working at full speed and the computer has reached ridiculous temperatures. One time it got so hot I could barely touch it with my hands! I am quite surprised it was not damaged by the excessive heat...
Does anyone else have this issue? Are there any solutions?

Try resetting your computer's SMC:
http://support.apple.com/kb/HT3964
If that doesn't resolve the issue, you may want to download and install AppleJack, a free, open-source utility that runs in Single User Mode and that has sorted out occasional problems with sleep, failure to shut down, etc. on my machines.
http://applejack.sourceforge.net/

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