Most people don’t know that the half-life of caffeine is five to six hours. If you search for where to buy want a bump and take it at around 4 PM, half of the chemical will leave the bloodstream by 9 PM or 10 PM. It means the other half of the caffeine keeps blocking the adenosine receptors from connecting to the brain and interfering with your sleep.The only way to avoid this problem is to experiment with your caffeine intake to pinpoint the best time to take caffeine. In doing so, you’ll stop it from interfering with your shut-eye.