Experiments with sleep deprivation proved that... 1. ...it inevitably leads to death. 2. ...its repercussions have finally become predictable. 3. ...it is likely to result in a variety of health problems. 4. ...animal and human reactions are very much alike.

Experiments with sleep deprivation proved that... 1.  ...it inevitably leads to death. 2.  ...its repercussions have finally become predictable. 3.  ...it is likely to result in a variety of health problems. 4.  ...animal and human reactions are very much alike.