Someone who is up at night and normally sleeps through the day.

2) one who is more active at night than through the day.
My nocturnal friend is always up at 3am and ends up not coming into school be ause he went back to sleep
by YOU'RE A SPOON May 08, 2016
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The natural state of college students.
"My roommate is asleep at 3 PM. I haven't seen her awake in a week."
"Oh; no worries. Mine is too. She's nocturnal."

"Dude, your paper is due in 12 hours."
"I'll get it done. I'm an owl, nocturnal."
by Nocturnal_Owl December 29, 2011
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A word to describe wierd poeple that you see at night and night time only.
The not nocturnals are out.
by Robert Kahn May 19, 2005
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