[Puke]

IQ tests, especially the kind you will find at places like Tickle, are not very accurate. they usually express a bias towards certain language speakers and cultural upbringings. there is really no such thing as an entirely unbiased IQ test.

but to answer your question, your reaction time and ability to correlate information is controlled by your neurochemistry. which is impacted by being sick. or drunk. or emotionally distraught. or any number of other things.