☆Do some further reading and report what you have learned. The following links maybe of help.

1. Napping Habits Tied to Sleep Disorders

http://www.washingtonpost.com/wpdyn/content/article/2008/05/01/AR2008050102634.html

2. 6 tips for better sleep this summer

http://edition.cnn.com/2013/06/06/health/sleep-summer/index.html

3. Lack of sleep may shrink your brain

http://edition.cnn.com/2014/09/04/health/no-sleep-brain-size/index.html