Bibliography

1. http://www.sleepfoundation.org/article/how-sleep-works/what-happens-when-you-sleep
2. http://www.sleepfoundation.org/sites/default/files/SleepWakeCycle.pdf
3. http://www.sleepfoundation.org/article/how-sleep-works/how-much-sleep-do-we-really-need
4. http://healthysleep.med.harvard.edu/healthy/getting/overcoming/tips
5. http://www.sleepoz.org.au/files/fact_sheets/AT09%20-%20Sleep%20Hygiene.pdf
6. http://healthysleep.med.harvard.edu/healthy/getting/overcoming/tips