I have an odd relationship with caffeine.
If I need a little pick-me-up or am going to be on my feet for a while, then consuming some helps me focus exactly as you might expect. Although it arguably doesn’t improve my decision-making capabilities.
But if I don’t really need it—that is, when I’m well-rested but still have some out of habit—or if I consume too much (e.g. typically more than a single cup of coffee), then it often makes me feel tired. Moving my body sometimes helps when this happens, but what always alleviates that heavy feeling just behind my forehead is taking a 30-45 minute nap.
If you’re thinking that’s a bit abnormal, you’re right. But that’s the way my body operates for some reason. So while I do occasionally enjoy a cup of coffee in social situations when I don’t actually need any, I’ve generally learned to use caffeine strategically.
And that leads me to the point of today’s tip: Everyone responds to caffeine differently, and due to its ubiquitous nature and usage, you might not realize how much it could be affecting your sleep (even if, unlike me, it doesn’t occasionally put you to sleep).
Caffeine in the body
Both the magnitude and duration of caffeine’s effects in the body depend on numerous factors, including age, sex, body composition, health issues and medications, diet, habituation, and genetics, with the final two factors having the greatest effect.
That is, the more caffeine you consume, the less it typically affects both your focus and your abilities to fall and stay asleep. As far as genetics are concerned, some people simply process caffeine faster or slower than average.
Speaking of which, it takes about six hours for caffeine to be reduced by half in the body (i.e. its half-life) and twelve hours for it to be reduced by 75%. If you happen to be a fast or slow caffeine metabolizer, those timeframes will slide in either direction. Still, this means that some of the caffeine you get from drinking a coffee (or equivalent) in the late morning or early afternoon will likely be in your system anywhere from 8 PM to 2 AM (or longer).
If you’ve built up a tolerance by regularly consuming your last cup of joe somewhat later in the day, this might not be an issue. On the other hand, if you’re a slow caffeine metabolizer or consume caffeine later in the day only occasionally, it could have multi-day consequences by causing you to sleep poorly that night, wake up fatigued the following morning, and perpetuate the cycle.
And since sleep affects almost every function in the body, that’s a rather unpleasant cycle to repeat.
Putting it into practice
If you consume caffeine regularly like 80% of the rest of the world’s population and aren’t one of the “lucky few” (?!?) who can or occasionally need to sleep afterward, you might consider experimenting with your consumption for a couple weeks.
That doesn’t necessarily mean completely cutting it out of your day as some sources suggest—caffeine headaches, ugh(!!!)—but rather bumping your last dose to earlier in the day, switching to a lower dosage (e.g. tea, decaf coffee, or half decaf + half regular), or a combination.
Of course, remember to subjectively and objectively track what you’re doing and how you feel as much as possible. By definition, trends take time to observe, we often don’t remember details from more than a day prior, and, as I often reiterate in these tips, consistency is more important than intensity for long-term results (and tracking improves consistency).
And who knows? You might find that, in specific circumstances, caffeine makes you sleepy too.