My elderly next door neighbor passed away at 2:00 this morning. She was about 85 years old and she had been diagnosed with lung cancer last week. She lived with her daughter, son-in-law and grandson. The grandson's wish was that his grandmother would live to see his birthday. So at 2:00 AM, she walks into his room (mind you she couldnt really walk) and says, "I'm sorry, I can't do it." Her grandson goes to get his mother, and when his mother comes in, his grandmother collapses into her arms and dies.
I guess this shows that she knew she was about to die, and that just seems kind of creepy to me.