Open Cloze — Practice

Sleep is something we all need, yet few of us get (1) of it. Research has shown that adults (2) require between seven and nine hours per night. (3) spite of this, a growing number of people regularly sleep for fewer (4) six hours. The consequences can be serious: lack of sleep has been linked (5) heart disease, obesity and depression. What makes the situation (6) worse is that many people are unaware of just (7) badly they are sleeping. It is only (8) they begin to suffer from health problems that they realise the damage.