The longer you are awake, the more adenosine will accumulate in your brain, creating pressure to sleep. Adenosine is a brain molecule (neurotransmitter) that helps register elapsed time. Caffeine Delays SleepĬaffeine tricks your brain into thinking it’s not tired by blocking your sleepiness signal, adenosine. If you want to keep your sleep cycles on track, it’s a good idea to understand how your genes, gender, diet, and dosage all impact how your body processes caffeine. This system is especially susceptible to being disrupted by caffeine. Alongside your circadian rhythm is a complementary sleep pressure system in your brain. Your 24-hour circadian rhythm is the primary factor that determines your sleep and wake cycle.
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