Can’t get into the dream

Today I went to sleep and was concentrating into getting inside my dream, after a few I Started feeling everything, the vibrations, the twitching and lightweight of my body. I was totally calm but the only thing that was missing was getting into the dream. I was trying to imagine something to make it faster but it didn’t work . It took a while and I decide to give up and I think I just fell asleep. Idk if trying to make a image is the problem or I need to stay more focused for longer . Any tips on what should I do ?