I only started attemting dream recall about a week ago, and the first few days went great i was remembering 1 - 3 dreams every night and for the past 4 days it just stopped i havent rememberd one dream

every night before bed i simply remind myself "From now on ill remember my dreams when i wake up" and i repeat it to myself a couple of times while lying down till i drift away to sleep. Am i doing something wrong? any suggestions?