Moment 141: What Coffee Is REALLY Doing To Your Sleep!: Matthew Walker

Uh I mean, will hurt your sleep and probably at least three ways, some of which you most people are not aware of. The first issue is the duration of its action.

So caffeine has what we call half life. of about five to six hours. In other words, after about five to six hours Half of that caffeine is still in your system. What that means is that caffeine has a quarter life Of somewhere between ten to twelve hours.

So if you have a cup of coffee at Noon at midday. A quarter of that caffeine is still in your brain. At midnight. So having a cup of coffee at noon.

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