Which Hormone is responsible to keep us awake and sometimes sleepy even when we are not tired?

The reason to keep us awake and sometimes sleepy even when we are not tired, is due to a hormone called
[a] Adrenaline
[b] Adenosine
[c] Thyroxine
[d] Serotonin
Aderaline - adjust heart rate,BP, affects breathng,pupil in the eye. Adenosine - promotes sleep and suppresses arousal. Thyroxine - heart and digestive function, metabolism, brain development etc Serotonin - Regulates sleeps make feel sleepy even when not tired and keep awake too. Other Hormones Sleep hormone - Melatonin Stress hormone - Cortisol Love hormone - Oxytocin Hunger hormone - Ghrelin Thirst hormone - vasopressin Emergency Hormone - Adrenaline