Did Dumbledore divide his soul in HP and Half-Blood Prince?

[Ken]

No: HPFGUIDX 157887

 I read the book and noticed how tired he was all the way through
the book... and got to wondering if he had divided his soul... it
would be a great way to make a comeback in the next book.
 It would also explain why Snape suddenly killed him if Dumbledore
had trusted him with this secret... might explain quite a few things
that happened in the book.

Ken