088 | 睡眠博士に聞く、眠りとカラダの深い関係(前編)

枕メーカーの「ロフテー株式会社」の睡眠改善インストラクター・矢部亜由美さんに、正しい睡眠についてお話を聞きました。
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人間が生きていくために、絶対欠かせないもののひとつ、「睡眠」。すっきりと目覚めた朝は、その日一日を快適に過ごせるし、寝不足が続くと頭が働かず、仕事でもミスを連発......など、自分の昼間の活動内容が、眠りの質によって左右されていることを実感することもあるのではないでしょうか。

そこで、今回は枕メーカーの「ロフテー株式会社」の睡眠改善インストラクター・矢部亜由美さんに、正しい睡眠についてお話を聞きました。

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―そもそも、睡眠は体にどのような影響を与えているのでしょうか?

「みなさん、体を休めるためにだけ眠っていると思いがちですが、実は脳を休めるために眠っているんです。つまり、人間の脳は眠らない限り休まらない。2時間の睡眠不足は、お酒を飲んでほろ酔いになっているのと同じくらい脳の働きを弱めます。ほろ酔いで運転する人はいませんが、少しの睡眠不足だったら運転してしまう人もいると思います。でも実は同じくらい危険なんですよ。」

―長い時間、たくさん眠ればよい、というわけではないですよね?

「必要な睡眠量というのは、人それぞれ違います。自分の適正な睡眠時間を知るには、昼間、活動的に動けているかどうか、見てください。昼間いつも眠い、イライラしているなどの現象が起きた場合は、睡眠時間が足りていないと思ってください。本来必要な睡眠時間が取れていない人は、休みの日にたくさん寝てしまうという傾向もあります。自分に合った睡眠時間で、質のよい眠りをとることが大切です。」

―質がよい睡眠というのは、どのようなことでしょうか?

「寝付きがよい、途中で目覚めてもすぐ眠りにつける、朝すっきりと目覚められる、日中イキイキと活動できる。この4つのポイントが満たされていれば、よい睡眠をとっていると言えますが、なかなか難しいんです。質のよい睡眠を取るポイントとしては、寝る1~2時間前の過ごし方がとても大切になります。寝る直前までスマホやPCの画面を見ているのは今日からやめましょう。まずは1週間、ベッドにスマホを持ち込まない生活をしてみると、眠りの変化を感じる事ができるかもしれません。」

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―寝る前に、やったほうがいいことはありますか?

「人間の深部体温は昼から夜にかけて上昇し、それが下がっていくときに眠くなります。なので、40℃くらいのぬるめのお風呂にゆっくり入って、体温を少し上げて、眠る頃に体温を下げていくようにすると、スムーズに寝つきやすくなります。お風呂あがりはストレッチなどをして、リラックスして過ごしましょう。眠れないからといってお酒を飲むのはNGです! お酒には入眠作用もありますが、それは一時的なもの。同じく覚醒作用もあるので、途中トイレなどに起きてしまうと、再度眠りにつくのが難しくなります。晩酌で楽しむ程度にしましょう。」

後編では、昼寝の必要性、よりよい眠りにつくための快眠グッズについて深くご紹介します。

イラスト/榊原ミドリコ、文章/宮原未来

矢部亜由美

●やべ・あゆみ

〈ロフテー株式会社〉の快眠スタジオという部署にて、睡眠改善インストラクターとして活動中。「眠り」についての講演会を行うなど、質のよい眠りの重要性を伝えている。

【関連記事】

(「からだにいい100のこと。」より転載)

10 Energizing Yoga Poses
Half Sun Salutation (Surya Namaskara)(01 of10)
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Sun Salutation sequences are traditionally performed as a way to awaken the body. \"This is great to do upon rising, even before you have had your first cup of coffee,\" Bielkus says. \n\nTo perform the sequence, stand up straight in Mountain Pose (Tadasana) with the feet together and arms at the side of the body with open palms. Sweep the arms up and extend them over the head on the inhale, then exhale and bow forward into a forward bend. On the inhale, lift the torso halfway up, place your hands at your shins and extend the spine. Fold forward again on the exhale. When you inhale, sweep back up and bring the palms together into prayer. Repeat this sequence three or four times. \n\nClick here for a video tutorial. (credit:Getty Images)
Camel Pose (Ustrasana)(02 of10)
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The gentle heart-opening stretch of the camel pose -- performed either with the hands on the lower back or reaching down to touch the heels -- can be highly invigorating for the entire body. \n\n\"Camel is great because it\'s a total front-body opener,\" Bielkus says. \"You have the front of the legs moving forward. ... The core is stretching and the torso is lengthening up. The chest is really opening and expanding so that the lungs can expand full of breath.\" (credit:Getty Images)
Warrior II Pose (Virabhadrasana II)(03 of10)
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\"This pose combines both leg strengthening and mild back bending, bringing energy into the body,\" Bielkus says. \"Just like the name suggests, this pose awakens the warrior within -- power and strength, but with ease.\"\n\nClick here for basic Warrior II instructions, and try adding what Bielkus calls the \"breath of fire\" for an extra energy boost. \n\n\"A great way to rev up this posture is to add in breath of fire -- rapid belly breath, focusing on the exhalation,\" Bielkus says. \"To start, take a deep breath in and then pump the navel in as you exhale. The inhale will take care of itself.\" (credit:Getty Images)
Triangle Pose (Utthita Trikonasana) (04 of10)
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After Warrior II, try going into a restorative Triangle Pose. Straighten the front knee and extend the arm forward and then down to the shin, the floor next to the leg, or a block. Reach the other arm up and turn to face the sky, breathing deeply for five breaths, Bielkus advises. Then, repeat on the other side. \n\n\"This pose is about fully expanding not contracting,\" Bielkus says. \"Focus less about stretching and more about expanding and bringing breath and energy to every cell, every skin pore, every fiber of your being.\" (credit:Getty Images)
Side Plank (Vasisthasana)(05 of10)
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For the whole body-strengthening Side Plank, start in a plank pose. Turn to the right side, stacking the feet on top of each other, and lifting the left hand. Breath deeply for five breaths before repeating on the other side. If you\'re looking to modify the pose, Bielkus suggests bringing either the bottom knee or the forearm down to the ground. \n\n\"Yoga brings our mind to a oneness and a focused attention,\" Bielkus says, regarding the balancing poses. \"The more that we\'re coming into a mental clarity or focus, the less energy we\'re expending on that stress. The cortisol levels can drop and then we feel a little more energized.\" (credit:Getty Images)
Chair Pose (Utkatasana)(06 of10)
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The dynamic Chair Pose is performed by standing with the feet together or hip-width apart, and bending the lower body down as if you were sitting on a chair. Raise the arms to the ears and raise the chest up to complete the pose. \n\n\"This pose is literally translates from Sanskrit as \'powerful\' pose,\" says Bielkus. \"Sometimes in class, I refer to it as lighting bolt pose because [of] the amount of energy it creates in the body by using the big muscles of the legs and glutes while also creating a slight backbend, which awakens the spine.\" (credit:Getty Images)
Half-Moon Pose (Ardha Chandrasana) (07 of10)
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In addition to warding off stress and anxiety, the Half Moon Pose can be therapeutic for fatigue, according to Yoga Journal. In a forward fold, bring the right hand about 10 inches in front of you and slightly to the right, extending the left leg up while the hips and torso open. Extend the left arm up and hold the pose for five breaths before repeating on the other side. \n\n\"Any balancing poses are great for finding that inner balance,\" Bielkus says. (credit:Getty Images)
Bridge Pose (Setu Bandha Sarvangasana)(08 of10)
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\"Back bends are all about unlocking the energy of the spine and nervous system,\" Bielkus says. \n\nLying on your back, bend the knees and place your feet flat on the floor with arms by your sides. Lift the hips up high and interlace the hands together or leave the arms at the sides of the body. Breathe deeply for five breaths and repeat several times. (credit:Shutterstock)
Locust Pose (Salabhasana)(09 of10)
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For this strengthening pose, lie on your belly with arms by your side and palms down. Then, gently lift the arms, legs, chest and head off the floor and breathe deeply for five breaths, trying to lift up higher with each breath. Repeat three or four times, being careful not to strain the neck. For more of a challenge, extend the arms in front of you, as pictured at left. \n\n\"You\'re really stimulating the upper, middle and lower back, and the muscles of the hamstrings are engaging\" Bielkus says. \"You\'re using so many muscles in the body to lift yourself off the earth. The neurons are firing to make that all happen.\" (credit:Getty Images)
Right Nostril Breathing (Surya Bhedana)(10 of10)
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This energizing pranayama (breathing exercise) offers a counterpoint to the calming left nostril breath. To perform the exercise, sit upright in a chair or on the floor in a comfortable cross-legged position, blocking the left nostril with the thumb and extending the fingers. Breathe long and deep, in and out of the right nostril for around five minutes, Bielkus advises. \n\n\"The right nostril is associated with the energy of the sun,\" Bielkus says. \"This breath is stimulating, invigorating and awakening.\" (credit:Getty Images)