I'm bipolar type 2 (diagnosed 1995) with a 21 year old son, diagnosed type 2 when he was 14 (by doctors- I knew when he was 6-7). I have noticed that when one of us is cycling high or low, the other seems to follow the pattern- even when he lived 2 hours away! I can predict when he is going manic or crashing based on how I feel. I know women who live together often end up with synched menstrual cycles. But are synched bipolar cycles a thing?