Following on from the previous point about whether caffeine can be dangerous, it’s not just the amount of caffeine that you consume but also when you drink it that can be important, especially related to the point of insomnia. Investigations into the correlation between caffeine and interrupted sleep patterns concluded that even at six hours before bedtime but even more so at three hours and immediately before, the ability to fall asleep and to stay asleep was definitely impacted. The general conclusion was that for a good night’s sleep, limit your last intake of caffeine to mid-afternoon, around the 4pm mark to be sure of a sound night’s sleep.