Out of curiosity, are you a frequent cannabis user? I found I didn't remember my dreams when I smoked cannabis, however after a long break I started to remember dreams vividly.
The only time I seem to remember dreams is when my sleep is disturbed. Most nights I go to sleep and wake up in the morning, no (remembered)dream. If something wakes me up like indigestion or needing to pee I’ll often remember a dream.
A dream journal really does help though. The last thing most people want to do when sleepy is write though.