The answer scientists say lies in each individual’s biological internal clock or circadian rhythm.
The human clock is about 24 hours, thanks to Earth’s 24-hour light-dark cycle, but some people have a slightly longer natural cycle, and some are slightly shorter.
If your circadian rhythm is on the long side, you’re more likely to be a night owl. If it runs short, you’re probably an early riser.
@Therese-Moderator haha yes I like your thinking! … not sure though because I was born in the early hours of the morning and I am definitely not an early morning person!
I was definitely a night owl when younger (could close a bar down at 2:00 a.m. and be okay going to work the next morning at 8:00. Now I am the opposite…ready for bed no later than 10:00 and hard to even rise before 8:00 a.m.
I think I’m a night owl. Takes me hours to get going in the morning. I have to be very careful about sits I apply on if they mention the dog(s) need to be walked prior to 0800! I don’t like to eat late though nor do I drink coffee after my one cup in the morning. I haven’t used an alarm clock in about 40 years so maybe I don’t fit the typical stereotype of a night owl!
@Debbie-Moderator like you I was definitely a night owl when I was younger. When I was at University in France for a year we were walking home from a night out and realised that our 9am Economics Lecture was about to start, so we went to it!
I am still not a morning person but I have to be up for work and I need my sleep. These days I need to be in bed by 10pm to function the next day!
I’m a late afternoon - evening person. I like to get to bed around 11:30 to midnight but somehow manage to get up early if I have a charge that must be attended to early. I am really suffering today with this time change – In the US we turned the clocks ahead early this morning. I’m a zombie. I think I’ll lounge around the house today with my sweet doggies and cat. They’re great company.
Definitely an owl. We lived in Barcelona for six years and the rhythm of the day there suited me perfectly. Eating at 9.30-10.00pm, maybe go to the cinema for a film starting at 10.00pm, concerts starting at a similar hour. Now sadly for various practical reasons we are back in the UK but we still maintain as much of our ‘Barcelona hours’ as we can. Oh yes and I can drink coffee at any time of day - in fact I used to take a cup to have whilst I read in bed at night!
@LizBCN Yes I certainly love the late eating when in Barcelona and other countries with the late dining and going out culture, such a lovely, family friendly atmosphere too.
I used to be a night owl too. Up past the wee hours and loved to languish in bed in the morning. Then I married an early-morning guy. Like a puppy with his tail wagging, he’s up early (5:30) every day regardless of whether he has something to do or we had a long travel day the day before. Between spending the last 22 years with him and my getting to that more refined stage of life, I now find I love being in bed by 10pm and jumping out of bed the next morning to wander around wherever we are and watch it come to life.
… not sure though because I was born in the early hours of the morning and I am definitely not an early morning person! 
