So let's start with exactly how caffeine works. Now in our previous episode on sleep pressure. We learned all about how caffeine can keep you awake during the day here. We're going to focus on how caffeine can impact your sleep at night. Caffeine is in a class of drugs that we call the psychoactive stimulants, and I'm sure that you knew that calf. In was some form of a stimulant. However, there are several hidden consequences of caffeine that you may be less aware of one of these, is the duration of action caffeine has what we call a half-life of about five to six hours in the average adult. In other words, after five to six hours, 50% of that, caffeine is still going to be in your system and what that means is that caffeine will then have a quarterly. Life of about 10 to 12 hours. So in other words, let's see that. You have a cup of coffee at 2 p.m. In the afternoon. Almost a quarter of that caffeine could still be circulating in your brain at midnight or perhaps even more than a quarter of that caffeine and the probably rather crass analogy. Here, would be that if you have a cup of coffee at 2 p.m., It would be the equivalent of getting into bed at midnight. Night and just before you turn the lights out, you Swig a quarter of a cup of coffee and you hope for a good night of sleep and it tends not to happen.
Caffeine's Half-Life Is 5-6 Hours; Its Quarter-Life Is 10-12 Hours