日中の活動量に比例する睡眠の深さ

【写真をクリックすると、画像が明瞭になります。】　

　５月10日、今朝の日の出は４時４１分【群馬県】です。写真は数年前に種が零れ、自然に生えた「ねむの木」です。上の写真はすでに明るくなった今朝５時３０分に撮りましたが、未だ葉が閉じたままで意外と寝坊です。下の写真は、昨日の日中に同じ位置で撮り、葉が開いてます。

　二枚の写真を比較すると葉が閉じてる状態と開いてる状態がよく分かります。下の写真を拡大すると、葉が全く左右対称に生えてることが分かり、眠るときはその２枚がピタッと閉じてます。一枚として閉じる相手がいない葉はありません。

　ところで、ねむの木は「夜になると何故、葉が閉じるのでしょう。」誠に不思議な植物でまるで人間のようです。(もちろん、人間の中には昼間寝て、夜活動してる人もいるようです。)

　しかし、ねむの木の就眠運動について、その原因は今でもよく解明されてないようです。上の写真はすでに明るい時間帯なのにまだ閉じていることから、あるいは気温にも関係するかもしれません。

　一方、人間の場合、充分な睡眠を得るには「日中の活動量が多ければ自然と深い睡眠になるでしょう。」現役中は夜１０時にはバッタンキューで朝までぐっすりでした。高齢となった現在では、努めて日中の脳活動と身体活動の両面を多くしなくてはならないと自覚していますが、寄る年波には勝てず、夜中に目が覚めます。その分、日中、うとうとしてるようです。

Dear my friends abroad

　The simultaneous interpretation for your understanding will be after my breakfast in Japan time.

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　The sunrise this morning on May 10th is 4:41 [Gumma Prefecture]. The photo shows a Silk Tree" whose seeds were spilled a few years ago and have grown naturally. The photo above was taken at 5:30 this morning when it was already light, but the leaves were still closed so that she was surprisingly overslept. The photo below was taken at the same location during the daytime yesterday, of course the leaves are open.

　If comparing the two photos, we can clearly see the fact that the leaves are closed and opened. If you enlarge the photo below, you can see that the leaves are completely symmetrical, and when she sleeps, the two leaves are tightly closed each other. There is not a single leaf that does not have a partner to close with.

　By the way, the "Silk Tree" is a mysterious plant, "Why does she sleep at night?" She looks just like a human. (Of course, some humans sleep during the day and are active at night.)

　However, the cause of the sleep movement of Silk Tree is still not well understood. The photo above shows that she is still closed even though it is already daylight, or the cause may relate to the temperature.

　On the other hand, in the case of humans, in order to get enough sleep, "If we have a lot of activity during the daytime, we will naturally get a deep sleep." During my active duty, I had a good sleep as soon as going to bed around at 10 p.m. and slept soundly until morning. Now that I'm older, I'm aware during night time. I need to make effort to increase both my brain and physical activity during the daytime, but I can't beat the aging process so that I wake up in the middle of the night. As a result, I seem to be dozing off during the daytime.

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