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Nehligh's 2010 review Nehlig (2010) wrote a systematic review article called "Is caffeine a cognitive enhancer?" (link to publisher, no PDF). On page S89 to S90 Nehlig reviews the evidence of caffeine as a cognitive enhancer within the context of a history of caffeine consumption: In caffeine non-deprived young (20–25 years) and older subjects (50–65 ...

Particulalry short wavelengths (such a UV light) have been shown to suppress melatonin[1], a hormone that regulates sleep. The authors also show that: All subjects had an elevated cortisol level in the 90 minutes prior to onset of light exposure compared with the corresponding clock time on the previous day So there's a kind daily memory in the ...

I think you may have answered your own question. You can build a GSR meter or purchase one online. You do not necessarily need to hook it up to your computer; if it has an LED you can simply record the results with pen and paper. If you want to measure heart rate, buy a stethoscope. Or if you want to be really cheap, check your pulse using two fingers; it's ...

It seems that there is a research literature on the topic of the relationship between body temperature and time perception. Weardon and Penon-Voak (1995) present a literature review of the topic which would be worth reading if this interests you. The following quotes their abstract: Experiments investigating timing behaviour in humans under conditions ...

I've long been thinking that arousal levels can be measured by an actigraph, although I have not seen scientific articles that deal with this topic. Nor did I conduct any kind of large scale test. A lot of actigraphy studies focus on sleep and distinguishing sleep from wakefulness. I hypothesize that actigraphy may say something about the level of arousal of ...