I often go long stretches of time without dreaming at all. However once a year or a maximum of twice a year, i see a massive nightmare. I carry the feeling of fear and hurt and grief in my body but i never retain the details or motifs of the sleep. What could be the reason that i never remember dreams? how could i prepare myself to deal with these periods better? I have been reading many psychology texts (currently: Psychological Science) but it is of no avail