TEXT C

　　There must be few questions on which responsible opinion is so utterly divided a s on that of how much sleep we ought to have. There are some who think we can le ave the body to regulate these matters for itself. "The answer is easy," says Dr . A. Burton. "With the right amount of sleep you should wake up fresh and alert five minutes before the alarm rings." If he is right many people must be undersl eeping, including myself. But we must remember that some people have a greater i nertia than others.This is not meant rudely. They switch on slowly, and they a re reluctant to switch off. They are alert at bedtime and sleepy when it is time  to get up, and this may have nothing to do with how fatigued their bodies are, or how much sleep they must take to lose their fatigue.