forgetting vocab so fast + a weird myth?

So I keep forgetting new words like immediately lol. I think I read somewhere that if you sleep on your right side it helps you remember vocabulary better? Is that actually true or am I crazy? Also maybe I should only study in the middle of the month? Idk, I feel like my brain is just numb when I look at flashcards. Is there a trick to make them stick? I'm so lost right now.