= 腺苷

• is a key molecule / neurotransmitter that builds up in your brain during wakefulness and triggers/induces sleepiness.
• is a byproduct of cellular energy use, accumulates in the brain throughout the day, promoting one’s need to sleep as levels rise.

Higher adenosine levels correlate with a stronger feeling of sleepiness, also known as ==Sleep Drive== or ==Sleep Pressure==.

• While you are awake, adenosine levels gradually rise, making you feel more tired.
  • Adenosine → APT (“Energy Currency”)
• When you are asleep, adenosine is cleared away, reducing sleep pressure.
  • APT → Adenosine