Supply the most suitable word for each blank

People who are deprived (1) …… sleep lose energy and become quick-tempered. (2).......... two days without sleep, a person finds that lengthy concentration ............. (3) difficult. He can force himself to (4) …… tasks well for short periods, but he is (5)…….... distracted. He makes many mistakes especially at routine tasks, and his attention slips (6) …… times. Even a "sleepless" person experiences periods in which he dozes off for a few seconds or more. He falls completely asleep ............(7) he is kept active continuously. Persons who go without sleep for more than three days have great (8)_____ thinking, seeing, and hearing clearly. They have periods of hallucinations during (9)…….they see things that do not really exist. They also confuse day dreams with real life and (10) …….track of their thoughts in the middle of a sentence.

People who are deprived (1) …… sleep lose energy and become quick-tempered.