References
- Connor, Steven (2010) ‘The dust that measures all our time’, http://stevenconnor.com/sand/sand.pdf, accessed 5 August 2015.
- Ekirch, Roger (2005) At Day's Close: Night in times past, New York: W. W. Norton & Company, pp. 300–23.
- Thorne, B. Michael (2010) ‘Paradoxical sleep’, in Irving B. Weiner and W. Edward Craighead (eds), Corsini Encyclopedia of Psychology, Volume 3 Chichester: John Wiley.
- Wehr, Thomas A. (1992) ‘In short photoperiods, human sleep is biphasic’, Journal of Sleep Research 1(2): 103–7. doi: 10.1111/j.1365-2869.1992.tb00019.x