Check your medications for what they are intended to treat and what side effects they cause as a result. I am bipolar too and major anxiety has been a problem - it is peeking right now incidentally. I too have had problems in the past with sleep anxiety. Since I have been taking Seroquel (Quetiapine) I have slept a good deal better. But Seroquel has not entirely been effective.

Something else to consider: sleep apnea. This is a physical condition that affects sleep quality and can aggravate night time anxiety. Mental health is one such factor in contributing to the apnea in turn.

I was just diagnosed with such and have begun to sleep with something called a cpap machine. It has helped with my sleep quality which in turn seems to be helping with night anxiety. I sleep through the night as opposed to waking hundreds of times with somethingerather on my mind.

Have a discussion with your doctor. There is a sleep quality test that can be done overnight in your own home.