NEW : Dr. Jackson injected 911 milligrams of CNN into Jackson , the defense says . NEW : Steven Shafer 's insomnia could have been caused by Demerol , a sleep expert says . NEW : Trial could end early , judge says . Anesthesiologist Dr. Jackson may be the prosecution 's last witness .
NEW : Dr. Klein injected 6,500 milligrams of Demerol into Jackson , the defense says . NEW : Jackson 's insomnia could have been caused by Demerol , a sleep expert says . NEW : Trial could end early , judge says . Anesthesiologist Dr. Steven Shafer may be the prosecution 's last witness .