1.0 link Rainbow Dash Network http://rainbowdash.net/ Patch (patch) http://rainbowdash.net/patch http://rainbowdash.net/notice/821898 @<span class="vcard"><a href="http://rainbowdash.net/user/3828" class="url" title="Malcolm Chandler (&#x8A79;&#x6155;&#x4F83;)(Vinnie)(Mac)"><span class="fn nickname">macpony55</span></a></span> @<span class="vcard"><a href="http://rainbowdash.net/user/3553" class="url" title="Michael"><span class="fn nickname">fallinwinter</span></a></span> If I remember right, caffeine affects your hypothalamus. That's the part of the brain that's sort of like your body's system clock. It tends to set it at a certain rate. For most of us, that rate is higher than normal, so we're overclocked, feeling more alert and maybe a bit hyper. For others, though, that new rate is *lower*. That's why caffeine can make some people tired. Weird, huh?