I am a night owl. I like to go to bed very late. I am rarely awake early in the morning.
Do you have a sleep disorder, or is this just a choice?
I do suffer mild insomnia but much prefer to stay awake late. Night owls get their name from the nocturnal habits of owls.
Most owls are nocturnal, but some are considered crepuscular. Such as the pygmy owl. 
I didn't know that. I prefer to work the night shift as I feel more alert late than during the day.