Delayed sleep-wake phase disorder (DSWPD) is characterised by an inability to fall asleep at a socially acceptable time,  and an inability to wake up at conventional early times for school or work.Dr Gregory Carter from the University of Texas Southwestern Medical Center at Dallas, is conducting research into  'night owl preference', and what can be done to realign ones circadian rhythm.Read more: https://doi.org/10.5664/jcsm.5100