Is it that your really love them or you love them because you need them badly?
If you are getting enough sleep at night and still require a long nap, then something may be wrong.
True that young people need more sleep than most. Some doctors think that young people till the age of 21 may actually need 12 hours of sleep.
But sleeping poorly at night, or even thyroid issues or other underlying health issues can make a long nap necessary.
Could also simply be habit. I remember when I was young I loved afternoon naps. So quiet from the noise and busy day. It was a great way to quiet down and slow down. Plus in the spring and fall, an awesome breeze blowing through my window would knock me out in seconds. We had a big tree outside our window.
I lived in a third floor apartment so I would hear the rustling of the leaves. My mom always had snacks ready after school and we would eat and off to do homework or what ever. On days where I knew homework was a breeze, I would just take a nap.
A nap at the right time any day can seem like a little piece of heaven if it leaves you feeling refreshed.