1. American Academy of Sleep Medicine (2014) International classification of sleep disorders, 3rd edn. American Academy of Sleep Medicine, Darien, IL
2. Asahi S, Egashira S, Matsuda M et al (2003) Development of an orexin-2 receptor selective agonist [Ala(11), D-Leu(15)] orexin-B. Bioorg Med Chem Lett 13:111–113
3. Banga AK (2006) Therapeutic peptides and proteins: formulation, processing and delivery system, 2nd edn. CRC Press, Boca Raton, FL
4. Bixler E (2009) Sleep and society: an epidemiologic perspective. Sleep Med 10:S3–S6
5. Brambilla D, Luciani P, Leroux JC (2014) Breakthrough discoveries in drug delivery technologies: the next 30 years. J Control Release 14:S0168–S3659