If this process alone was in control of your sleep/wake cycles, in theory you would have the most energy when you woke up in the morning.
With sleep/wake homeostasis, the longer you are awake, the greater your body senses the need to sleep. These are called sleep/wake homeostasis and the circadian biological clock. Two body processes control sleeping and waking periods. While you sleep, the chemical slowly dissipates. Caffeine promotes wakefulness by blocking the receptors to adenosine. Adenosine seems to work by slowly building up in your blood when you are awake. One chemical involved in that process is called adenosine. Other nerve cells stop the messages that tell you to stay awake. Neurotransmitters act on parts of the brain to keep it alert and working well while you are awake. These include norepinephrine, histamine, and serotonin. Nerve cells in the brainstem release neurotransmitters. Brain chemicals and sleepĬhemicals called neurotransmitters send messages to different nerve cells in the brain. These cycles are triggered by chemicals in the brain. How and when you feel sleepy has to do with your sleep/wake cycles. Later, your energy levels soar just in time for bed. Other times you toss and turn for hours before you slip into a fitful sleep.
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