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Glass fiber, oratex and other materials from Solvay, Bayer, etc. are used, Ref: Ref: http://www.betteraircraftfabric.com/news-2015.html - http://www.solvay.com/en/binaries/Technical-developments-of-Solvay-04-2015-166137.pdf

20-min nap time: Ref : http://www.thenational.ae/uae/technology/solar-impulse-pilots-will-sleep-in-20-minute-instalments

Maximum altitude is 8500m (FL280) and the aircraft uses a SAS: Ref: - http://info.solarimpulse.com/timeline/view/6509#.Vehn452qpBc - http://info.solarimpulse.com/en/our-adventure/piloting-a-solar-airplane/#.VehocJ2qpBc

Comments: - There is no solar-cells on the vertical stabilizer (thus "horizontal stabilizer" is more accurate than "tailplane").

The aircraft contains lithium-polymer batteries (as correctly stated in the section above), not lithium-ion. Ref: - http://info.solarimpulse.com/en/our-adventure/building-a-solar-airplane/#.VehpYZ2qpBc