In her TED talk, Kelly McGonigal presents the case that stress is your friend (not too much). I have experienced how stress can be a valuable friend for ideation, the fancy term to describe having ideas.
I found, that to have lots of ideas, a pre-requisite to have good ideas, you need a brainstorming session.
I also found, that having a two minutes brainstorming session gets me roughly the same number of ideas than a two hours session.
By putting a very short time limit we trigger our stress responses, even if we know perfectly well that the limit is artificial. The stress responses are here to help us manage dangerous situations, being stressed is also being focused, there is no time be distracted, and so we get more results on that single thing we are trying to do. Having ideas.
Try it out.