Access Hollywood reports on more details in this terrible tragedy...
HOLLYWOOD, Fla. (February 8, 2007) -- According to a credible source, an employee of Anna Nicole Smith found her in her room in the Hard Rock Hotel and Casino in Hollywood, Florida. The employee pulled back a sheet and discovered that she appeared to have choked on her own vomit.
The same source claims that Smith took what was referred to as a "children's sedative," and had "kept passing out" before her death.
Read the rest here:http://www.accesshollywood.com/news/ah3965.shtml

It seems Anna Nicole had a marked predilection toward self-destruction, so this possibility would not surprise me. This is what I said about Anna Nicole in a bittersweet tribute:
Hole in the Soul
(of Anna Nicole)
Dr. BLT (c)2007
http://www.drblt.net/music/AnaNicole.mp3
Posted by: Dr. BLT | February 15, 2007 at 12:31 PM