This excellent video by Delayed Sleep Phase Disorder (DSPD) expert Dr. Peter Mansbach of the Circadian Sleep Disorders Network (CSDN) explains what DSPD is, the challenges it presents and possible causes.
My favorite line is when Dr. Mansbach says (at 1:19) "this is REALLY hard for a person with normal sleep to understand." Exactly!
By the way, you will notice that Delayed Sleep Phase Disorder is referred to as Delayed Sleep Phase Syndrome by some. An explanation of the difference between a syndrome and a disorder is here.
Be sure to check out all of CSDN's videos about circadian rhythm sleep disorders!
