The Aquarium is Direct3D, not OpenGL. In the full version of the Aquarium, the Settings screen has a checkbox to enable or disable monitor-sleep.
Last week, Microsoft told us about a bug in their DX8 example code which disabled sleep mode on some computers, especially laptops. The next version we deliver to them will encorporate their fix. I don't know how (or if) they plan to make this bug fix available to current users of their 3-fish demo.
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