Sleep

Was reading a book called "Brain Rules". The author stresses 12 principles based on research and science which he emphatically states will increase the efficiency and capacity of your brain to its maximum potential.
One very important principle is sleep.
For your brain to function well for the day as well as in the long run you need to sleep well. Have a good night's sleep and wake up fresh.
Depriving your brain of sleep over a long period of time will cause irreversible damage to some parts of it. It will kill brain cells and some of your skills along with it. So keep this in mind and learn to sleep well. Do not wake up late to watch movies or TV or to waste time on your computer or even to play games(card games etc).
It is simply put, the absolutely topmost priority for your brain's longevity. Try to imagine yourself unable to process even the simplest of things as early as 50 yrs...that would suck. So sleep well and do that daily.
Sweet dreams!