Cloze Test

Tonight between eleven o'clock and one o'clock (0)______ of people will start yawning. Very soon, they will (1)______ undressed, lie down, and close their eyes. A few minutes later, they will be (2)______.

Sleep is a powerful (3)______ on all our lives, and a 60‐year‐old person has (4)______ almost twenty years asleep. The traditional theory about sleep is that our brain needs to (5)______ for several hours to refresh itself and to 'file' in our memory everything that has happened to us (6)_____ the day. We can put off sleeping for a limited period, for instance if we (7)_____ to an all-night party, but sooner or later we have to sleep. If we are not allowed to sleep, we suffer hallucinations, and (8)______ die. However, Ray Meddis, a scientist at the Sleep Research Unit at Loughborough University, has a (9)______ new theory. He suggests that we don't really (10)______ to sleep at all.