Why can't I wake my sleeping computer?

I have a 1.83GHz MacBook that, once it goes to sleep, it won't wake up. I have to force power off and reboot it to get it to work. It's running 10.6.8 and has 2Gb of RAM.
Thank you in advance.

There's a couple of ways to get through to the authorisation controls in the 11.0.x versions.
The control is still in the Store menu, but first (if you're using iTunes versions 11.0.x) you might need to bring up the menu bar to see the Store menu.
If you're using 11.0.x, click on the wee boxy icon up in the top-left corner of your iTunes to see the "Show Menu Bar" control, as per the following screenshot:
Then you'll find the control in the Store menu:
Alternatively, if you don't want to bring up the menu bar, it's still possible to get into the authorise controls via nested menus accessible from the wee boxy icon. Here's a screenshot of where to find them:

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Why can't I wake my sleeping computer?

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