I used to know how severe my depressed episode was based on whether I "lost time" or not - that is, if I could remember details and when they happened. Large portions of my adolescence (when I was severely depressed) are foggy. I don't black out, I just suddenly realize one day that I have no idea what happened in the past fewontjs. I feel like I wasn't really living it. I remember specific incidents but have no concept of time when they happened unless it was near a significant date. This had not happened to me in years but I "lost" this past January and February. I obviously went to my job and functioned but without looking at my grade book I can't name specific lessons or assignments. So yes I do "space out" when my depression is severe enough. It sucks. I also feel like I forget words and forget what I'm doing and lose track of time.