Places/situations I have ideas in?

There's a constant blur of ideas running through my brain at all times and sometimes it's really hard for me to go back and un-blur them so most of the time I ignore them. But most of my ideas come to me after midnight when I should be sleeping and my brain is still working. This normally results in me either grabbing my macbook and being up for the next few hours in a desperate attempt to extract the image from my brain, or trying to put a pin in that particular idea and hoping that it hasn't re-blurred by the time I wake up.