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I. Answer the following questions on the text.

  1. How long do most of people spend their lives asleep?

  2. Why has the nature of sleep puzzled mankind for thousands of years?

  3. Sleep is remarkably passive one, isn't it?

  4. Do the brainwaves become larger or smaller as the sleep becomes deeper?

  5. How many kinds of sleep does human being experience every day?

  6. Who firstly became interested in the slow rolling eye movements?

  7. What term did Dr. Kleitman coin for rapid-eye-movement sleep?

  8. What is the other name of "quiet sleep"? Why is it called so?

  9. What usually happens in human being's organism during REM sleep?

II. Answer the question expressing your own opinion. (no less that 10 sentences).

Do people dream during NREM sleep or REM sleep?

III. Give Russian equivalents of the following.

Electrical activity of the brain; cerebral blood flow; brainwaves; an entirely different state of existence; act out our dreams; a remarkable feature; stay awake; accidentally; rolling eye movement; an entirely new kind of eye movement; breathe regularly; four from being a passive state; pull back the eyelids; convul­sive twitches; protect smb. from.

IV. Find English equivalents in the text

Проводить треть жизни; природа сна; исследовать сон; неактивное со­стояние; внешне спокойный; сердцебиение снижается; ритмично чередо­ваться; процесс обмена веществ; совершенно иное движение глаза; быстро двигаться; закрытые веки; спокойный сон; медленное, регулярное дыхание; активный сон; судорожное подергивание лица и кончиков пальцев; специа­листы предполагают; остановка дыхания; мозговое кровообращение; стре­мительно повышается.

V. Complete the sentences.

  1. Most of us spend... .

  2. Some people have enormous difficulty falling asleep, while others....

  3. While the sleeper is outwardly calm, the electrical activity of....

  4. As the sleep becomes deeper, the brainwaves... .

  5. While sleeping the metabolic processes....

  6. Dr. Kleitman became interested in....

  7. The "NREM" state is often called....

  8. At the onset of REM sleep the sleeper's body is... .

  9. Experts speculate that REM sleep protects us from....

  10. The NREM-REM cycle varies from....

VI. Make up sentences from the following words and word combinations:

  1. Probably; the third of our lives; most of us; spend; asleep.

  2. One; sleep; remarkably; is; active.

  3. The brainwaves; becomes; larger; as the sleep; deeper; becomes.

  4. The metabolic processes; while sleeping; the heart beat; slow; drops; down; and.

  5. Alternate; the entire sleep period; rhythmically; throughout; two kinds of sleep.

  6. Dr. Kleitman; rolling eye movements; sleep onset; became interested in; slow; the; accompany; that.

  7. State; is called; "NREM"; the; "quiet sleep".

  8. During; is not paralysed; NREM sleep; the body.

  9. NREM sleep; the first sleep of the night; always; is.

  10. During; can see; convulsive twitches of; REM sleep; we; face; fingertips; and.

VII. Speak about two kinds of sleep.