Children love to stay up as late as possible because of some TV show or computer game or hobby that they want to complete. They may be told to sleep early by their parents and they may follow but in their hearts they know that it is against their will.
For adults, though, they needed to stay up as late as possible because of certain deadlines to beat. Most adults will skip watching late night TV shows just to be able to get enough sleep. Especially for moms with small children down to the youngest newly born, having enough sleep is already considered rare. Like me, if given the chance, I would rather sleep. But then again, it is now a luxury for me because when the little one sleeps, that is the time that I start working.
But I know that having enough sleep is very important. Being able to sleep at least 8 hours a day without interruption means that a person is able to experience the REM state. That is when one gets to reach the dream state and rapid eye movement happens. That is the time when the body repairs itself. When we are awake and do our daily chores, and routines. We eat and drink. But these do not really contribute to our well being if we do not rest. A good workout would be nothing without sleep. It will just tear our muscles. But having enough sleep is what rejuvenates the body.
I would also like to mention that sleeping in darkness also produces melatonin that helps in warding off cancer. That is why it is also important to be sleeping at night rather than in the daytime.
Make it a habit to sleep at night. Get at least 8 hours of straight sleep, otherwise, you will be ripped off of good health sooner than later.