/lit/ - Literature

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>animals of considerable intelligence sleep soundly and long. even human beings require more sleep the more developed, as regards quantity and quality, and the more active their brain is. Montaigne ... Descartes ... Kant. for the more completely awake a man is, in other words the clearer and more wide-awake his consciousness, the greater is his necessity for sleep, and thus the more soundly and longer he sleeps. accordingly, much thinking or strenuous head-work will increase the need for sleep.

>that we have far less mental energy in summer than in winter is partly explained by the fact that in summer we sleep less; for the more soundly we have slept, the more completely wakeful, the more wide awake are we afterwards. but this must not lead us astray into lengthening our sleep unduly, since it then loses in depth and in soundness.
t. schopenhauer