2. A man sleeps on a conveyer belt under an American Airlines logo at John F. Kennedy international Airport in New York.

3. A man sleeps on a conveyer belt under an American Airlines logo at John F. Kennedy international Airport in New York.

4. A reveler sleeps on a bench after the second running of the bulls of the San Fermin festival in Pamplona, northern Spain

6. A man shoots a tranquilizer dart to put a hippopotamus to sleep at a flooded street in Tbilisi, Georgia

8. A migrant sleeps covered by a blanket on the rocks of the seawall at the Saint Ludovic border crossing on the Mediterranean Sea

10. A man sleeps on a seat at the Borough Hall subway station in the Brooklyn borough of New York February 10, 2015

12. A passenger sleeps along with her children at a railway station on a hot summer day in Allahabad, India, May 26, 2015.

14. A man sleeps under the shade of a tree on a hot summer day at a public park in New Delhi, India, May 27, 2015.

16. A stranded passenger sleeps in the transit area in Frankfurt's airport April 19, 2010