Fill in the gaps with appropriate word from the box .
insomnia ,REM sleep , stomach ,disorder ,cycle sleep , brain , dreams
#10: When you are 1) , you can't dream
# 9: On average, a person spends nearly 6 years dreaming during sleep
# 8: While sleeping dolphins keep half of their 2) awake. This sleep behavior helps them guard against predators
# 7: A study done by Xu Yan University in Hong Kong shows that your sleep positions can affect the kinds of 3) you have. According to the study, people who slept on their 4) had more dreams related to fox than people who slept on their back or their side.
# 6: Different species of animals have varied 5) requirements for instance a giraffe only needs 2 hours of sleep. On the other hand bats, sleep for nearly 80% of their lives.
# 5: Do you know that there is a sleep 6) called “Sleeping Beauty” syndrome those suffering from this disorder sleep up to 20 hours a day. Unfortunately its symptoms can last for days or even months.
# 4: According to historian Roger Eckrich, in the past it was normal to get to interval sleep 7) : one in the early evening a break and then a second later at night. Historical documents support this there are references to neighbors visiting each other in the middle of two sleeps and doctor suggesting couples conceive a baby after the first sleep.
# 3: According to a 2011 research study, the average U.S. worker loses approximately 11.3 days each year in productivity due to 8) causing a collective loss of around 63 point two billion dollars to US employers.
# 2: Some researchers believe that those who stay 9) late at night are more likely to have higher IQs than those who fall asleep early.
# 1: Elephants stand during non-rem sleep but as they slip into 10) they lie down.