"Why am I so sleepy?" What kind of disease is narcolepsy? I've heard the name, but few people know it properly. Do I have to fall asleep while walking to sleep? Is it a narcolepsy for me to close my ...

IT IS HARD to overstate the importance of sleep. Regular hours of rest offer organisms of all sizes a chance to consolidate memories, repair cells and boost the health of their immune systems. But the ...