Читать книгу The psychology of sleep онлайн

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The amount of sleep that suited you last year may not suit you to-day. You may really be getting better sleep and so needing less of it: or you may have to make up by quantity for a poorer quality. The test is that, if you are sleepy in waking hours, you need better sleep or more of it. If you are wakeful in sleeping hours, you need less sleep or else you are not getting the right kind. Good sleep is a habit, a natural habit as distinguished from an acquired habit, and when we learn to take it naturally, and in natural amount, we get a great deal more from it. It is fair to assume that purely natural habits, which continue from age to age through all stages of human progress, are essential to human welfare. Otherwise they would drop away from us as many useless physical parts have dropped. If you stop to think of this, you know that it is so; the man in the street and the girl at the ribbon counter do not know, so there is more excuse for them if they misunderstand. It may be that they usually sleep better than you do, and so do not need to know it.