Most suicides occur due to severe depression. But people with Bipolar can be more likely to act on suicidal feeling when in mixed state. But Its not always a planned thing. It can happen impulsively, just in the moment without thought, cos of overwhelming unbearable strong feelings. In my case I have been aware of suicidal thoughts/feelings arising suddenly, without planning and I have felt in conflict, part of me feeling like going along with it eg falling off high wall,falling down the stairs, jumping out of window etc. But part of me feels protected from doing something