"i take 25mg of nortriptyline at bedtime. i have taken it for 3 weeks. i toss and turn at night and sleep about 3 hours for 2 nights, then on the 3rd night, i am able to sleep 9 or so hours because of lack of sleep previously.  it has helped my neck pain considerably, but about 10 days ago, i began getting pain in both my knees and hips, which makes it even more difficult to sleep now.  at first, i believed it was because of the treadmill, but i stopped after 2 days using it to heal my knees and hips, but they are still hurting. also, i am experiencing memory loss. i am 68 years old."