Melatonin to regulate the rhythm of sleep
        
        Melatonin is a hormone secreted by the pineal gland, located between the two hemispheres, in the back of the brain. [...]
        
    
Melatonin is a hormone secreted by the pineal gland, located between the two hemispheres, in the back of the brain. [...]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
