I also thought that I don't dream much, but I started the habit of trying to remember if I dreamed something when waking up and if it's in the second half of the night I can almost always remember vivid dream content. Trying to remember dreams after being awake for a while (e.g. 5 minutes after getting up) is much harder in my experience. Most people have at least 2-4 REM sleep phases at night, to have none whatsoever would be quite unlikely unless you're regularly very sleep deprived.