One of the biggest benefits of heavy metal music is it can be a release for those who have stress, depression or anger issues. In a article titled " Extreme Metal Music and Anger Processing " there was an experiment done where they would have fans of heavy metal make themselves mad and then chose a metal song of their choice. Once they started listening to the song of their choice they notice their heart rate went back to normal. This shows how the music can be beneficial to someone on a personal level.
Also if you are feeling slow or lack motivation, heavy metal can most definitely help with getting your adrenaline going. whether its to help you stay up to write a paper or just trying to get that extra pump at the gym