Would like some sources to back up the following points:

* Financially succesful people (top business executives, succesful
entrepreneurs) tend to rise early.

* Happy peolple tend to rise early.

My experience is exactly opposite to the claim.  I would say Organized
and/or Methodical people rise early but it is not necessary they are
succesful. Organized and/or Methodical people do have a higher chance
of getting succesful.

No matter how successful I was, I would not be happy if I had to be an
early riser.  If I get up too early, the entire day is a painful
experience.

In fact, I've sometimes defined my career goal as being able to get up
when I want to.  The implication there is being self-employed in a
freelance occupation in which the hours I keep don't matter as long as
the work is done and done well.  I came closest to this ideal while
working as a freelance manuscript editor, which, however, didn't pay
well enough to keep the wolves at bay.

However, I am probably not using the most conventional definition of success.

Archae0pteryx

Well I am happy and I get up at 5 a.m. every morning. Always have. And
if I should ever want a lie-in, Daisy starts doing her nut so I've got
to get up anyway.

Classic medical teaching states that early wakening is associated with
depression (not happiness).  However, classic depression is also
associated with other findings such as loss of appetite, hopelessness,
loss of interest in hobies, etc.  Perhaps ther is research stating
that early wakening - without other depressive signs - is associated
with happiness; however, based on the above information, i think this
conclusion is unlikely.  In fact, the NIH states, "Sleeping problems
occur in almost all people with mental disorders, including those with
depression and schizophrenia. People with depression, for example,
often awaken in the early hours of the morning and find themselves
unable to get back to sleep."

Reference: http://www.ninds.nih.gov/disorders/brain_basics/understanding_sleep_brain_basic.htm#Sleep%20and%20Disease