howl at the moon

I've asked this question a few times, but no one seems to know what I'm talking about except for one other person. Do you ever feel different during the day time than you do at night? Am I a werewolf?

JUST LIKE A WEREWOLF
I AM FINE IN THE DAY
THEN THE SUN GOES DOWN
AND MY ENDS START TO FRAY

my palms start to itch
sanity is wearing thinner

fangs sprout out my gums    
all this happens before dinner

I DON'T MIND BEING JEKYLL
BUT IT'S HARD TO BE THE HYDE
CAN'T BEAT THE SYSTEM OF THE SKY
EVILS GROW IN THE NIGHTTIME

darkness falls above my head
and down goes the sun
i should expect this every night
the transformation has begun

NINE-O-CLOCK AND FULL OF FUR
MY GROWL'S GROAN AND DRONE
MY TEETH ARE SHARP AND SHINED
I'M READY TO DESTROY MY OWN

amazingly i'm the only one
to notice when i'm different
amazingly no one sees my fangs
their blindness is really quite sufficient

YOU'LL SEE 'DAY ME' AND 'NIGHT ME'
BUT YOU WON'T KNOW WHICH IS WHICH
WATCH WHEN THE MOON BEGINS TO RISE
AND YOU JUST MIGHT SEE ME START TO TWITCH.