I have thought for many years based upon reading that the majority (or close to it) of people meet their demise upon waking in the morning. a myth?

Mostly a myth but...: We can meet our demise any time of day. At least in hospitals, many people seem to die in the middle of the nite. Research suggests that sudden cardiac death outside the hospital most often occurs between 7 and 11 AM but this is not a particularly common form of death. Ultimately, the grim reaper (or angel of death) can visit at any time. See http://circ.ahajournals.org/content/75/1/131.full.pdf