How do I prevent bluetooth from reconnecting the keyboard?

A strange question I admit, but here's the deal:
I need to disable my keyboard overnight (no, don't ask why ), and the power button doesn't seem to work. It does turn the keyboard off, but after a bit, pressing any key will turn it back on again.
So I next thought of disconnecting bluetooth for the keyboard using the menu command. Just like the power switch, bluetooth reconnects itself after a few seconds. I can't turn off bluetooth altogether of course, as then I'd lose all control of my Mac.
As things are now, I have to shut down my iMac completely overnight, and I hate that. Isn't there a way to get bluetooth disconnected for the keyboard (and remain connected to the mouse), until I use the menu command again in the morning?
If not, is there another way to disable the keyboard? Why did Apple design the power switch to work only temporarily?
Thanks for your help!

So simple and yet so non-obvious, that I should have to hold a button for some time!
Thanks so much!

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... Then we can replicate this behavior by following these steps:
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3) Click on any other tab (or use the mnemonic keys 'ALT + 1' to 'ALT + 4').
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Hi Kleopatra,
Thanks for the reply.
Please allow me to clarify first: Actually the problem is not that the child components (inside tabs) get focused before the selected tab. The problem is: the component outside of the tabs gets focused before the selected tab. For example, the JButton in the SSCCE posted above gets focused when users switch between tabs, despite the fact that the JButton is not a child component of the JTabbedPane.
It is important for me to prevent this behavior because it causes a usability issue for forms with 'auto-scrolling' features.
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            gridBagConstraints.insets = labelInsets;
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            gridBagConstraints.gridy = i;
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* Crude but simple example for auto-scrolling to focused components.
* Note: We don't actually use FocusListeners for this feature,
*       but this is short enough to demonstrate how it behaves.
class AutoScrollFocusHandler extends FocusAdapter {
    private JViewport viewport;
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Now, while the focus is still within the tab contents, try to switch to any other tab (e.g. by clicking on the tab headers, or by using the mnemonic keys 'ALT + 1' to 'ALT + 4')...
... then you'll notice the following usability issue:
1) JRE 1.6 causes the focus to transfer to the JButton (which is outside of the tabs entirely) first; then
2) In response to the JButton gaining focus, the 'auto-scrolling' feature scrolls down to the bottom of the form, to show the JButton. At this point, the tab headers are hidden from view since there are many child components; then
3) JRE 1.6 transfers the focus to the tab contents; then
4) The 'auto-scrolling' feature scrolls up to the selected tab's contents, but the tab header itself is still hidden from view (as a side effect of the behavior above); then
5) Users are forced to manually scroll up to see the tab headers whenever they are just switching between tabs.
In short, the tab headers will be hidden when users switch tabs, due to the Java 6 behavior posted above.
That is why it is important for me to prevent the behavior in my first post above (so that it won't cause usability issues when we apply the 'auto-scrolling' feature to our forms).
Best Regards,
James

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