![]() However, it's also important to note that the study's 12 participants were given the maximum daily dose of caffeine (which is 400 mg, by the way). The study results showed that having caffeine even as early as six hours before bedtime can impact sleep, even if you don't actually notice the disruption. While there's plenty of research showing that caffeine disrupts sleep, only one study has examined how the timing of caffeine intake affects sleep. The short-and-sweet version is that most experts recommend setting your caffeine cutoff for 2 or 3 p.m. Unfortunately, this is a question with a fairly murky answer. But, put together, what does this mean for someone who's trying to have some caffeine without it affecting his or her sleep? And, if it's bedtime, keeping you from falling asleep. This means that up to six hours after drinking a caffeinated beverage, half of the caffeine you consumed is still present in your body - keeping you alert. To measure how long a substance like caffeine lasts in your body, scientists use a term called "half-life." This is the time it takes for the starting amount of the substance to reduce by half.Īccording to the FDA, the half-life of caffeine is between four and six hours. Instead, caffeine blocks them - preventing adenosine from binding and activating their sleep-promoting effects, keeping you awake and alert in the meantime.įortunately for your sleep hygiene, caffeine doesn't hang around in your body forever. Except, when caffeine binds to these receptors, it doesn't activate them like adenosine. ![]() Cue bedtime, and the cycle repeats the next day.īut, as mentioned, adenosine isn't the only molecule that can bind to these sleep-promoting receptors in your brain. After several hours of being awake, adenosine levels increase to a point where they start the process of making you sleepy. Its levels are fairly low by the time you're fully awake, but they slowly build throughout the day. In turn, this triggers pathways that slow neural activity and increase feelings of sleepiness.Īdenosine levels in your brain fluctuate. By binding to adenosine receptors in your brain, adenosine activates the receptors. It's able to do so because - as far as molecular structures are concerned - caffeine looks very similar to one of the naturally occurring molecules in your body that typically binds to these receptors, called adenosine.Īdenosine plays many roles - including helping to regulate your sleep/wake cycle. It's here that caffeine elicits its most classic effect - helping keep you alert and awake.Ĭaffeine accomplishes this by blocking sleep-promoting receptors in your brain called adenosine receptors. Once consumed, caffeine is very quickly absorbed and distributed throughout your body, including to your brain. ![]() So, when it comes to that gray area between late morning and early evening, how late is too late to drink that afternoon coffee you so desperately need - or even just a soda or iced tea with dinner - without it affecting your sleep? How does caffeine work? And, at the time, it felt like you needed it just as much as the sleep you're not getting now. (Right before bed, for instance.just in case.)īut, you needed that caffeinated pick-me-up to get through the rest of your busy, exhausting day. You know caffeine can keep you awake, and there are the obvious times to avoid it. Or, maybe you're counting the number of hours you might get if you fell asleep right now. Specifically, the number of hours you're not getting. Instead of counting sheep you're counting hours of sleep.
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