A few sleepless nights may well have been all to the good for Sarah-Jane Paine. She successfully completed her doctorate in 2006 on key factors affecting sleep and how they might be affected by ethnicity and socio-economic factors – and in the process became one of 500 new Māori PhDs last year. In a paper published in the international Journal of Biological Rhythms, Sarah-Jane, who is from Tūhoe iwi, saw a prevalence of both “morning people” and ”night owls” in New Zealand.