Caffeine dey make person react quick pass?

The broad review about performance separate the effects wey dey show more consistently for alertness, vigilance and attention from the ones wey no dey consistent for memory and higher-level executive functions. So, quick simple response no mean say every part of thinking improve. The attention review too check differences between tasks, regular use and withdrawal. McLellan et al., 2016 Einöther et al., 2012

Why your starting state matter

Person wey no sleep enough no be the same as person wey don rest well. Studies on sleep restriction show say attention problems dey build up, and one meta-analysis on total sleep deprivation show say e no affect every area of thinking equally. The effect of stimulant when person dey sleepy no mean say person wey don rest go get the same benefit. Van Dongen et al., 2003 Lim et al., 2010

Vigilance results too dey differ. Laboratory study fit measure slow-response mistakes, response speed and how performance change as time dey pass; short game fit focus on average or best response. Basner and Dinges show say the result wey dem choose affect how well psychomotor vigilance test fit detect sleep loss. Basner et al., 2011

Higher dose go give better result?

The attention review find say evidence no clear about dose-related differences and the effect of regular use. Say some experiments show benefits no mean say make you increase how much you take until your score reach your personal best. Evidence no show dose chart for browser test based on age, sex or body size either. Einöther et al., 2012

You need count the effect on sleep too

The sleep meta-analysis by Gardiner and colleagues find average reduction of 45 minutes for total sleep time after caffeine. E combine different doses, timing and people, so the combined average no be prediction of how one person go sleep. E show why person no suppose judge quick alertness benefit alone without thinking about the sleep wey come afterward. Gardiner et al., 2023

For one study wey compare against placebo, 400 mg wey dem give before sleep, three hours before sleep or six hours before sleep disturb sleep. This na high experimental dose, no be amount wey dem advise person to take. The result for six hours before sleep no mean say everybody go dey fine if dem take caffeine after that time. Drake et al., 2013

Wetin personal comparison really fit tell you?

One better attempt after coffee mix expectation, practice, normal score changes, time of day and caffeine exposure together. The attention review stress say comparison wey dem control well matter: game before and after wey no control other things no fit show the effect of the substance by itself. If you keep choosing your best attempt, e go even harder to know wetin cause the result. Einöther et al., 2012

If you already dey take caffeine, you fit record the amount wey you normally take and your sleep, alongside sessions wey you do under similar conditions, as informal observation. This no mean say make you start caffeine, increase dose or purposely lose sleep for test. Adult sleep agreement support regular sleep wey enough; caffeine research no show say stimulation make sleep unnecessary. Watson et al., 2015 Van Dongen et al., 2003

The conclusion wey evidence support get clear limit: caffeine fit affect performance for attention tasks under certain conditions, but you need consider complex thinking and later sleep as separate things. None of the studies wey dem cite confirm say caffeine or game dey make person generally smarter. McLellan et al., 2016 Gardiner et al., 2023