So I started learning. I learned in different ways, you know - to watch German movies, play German speeches on my iPod when I sleep. Your brain remembers things you don't even know. It's beautiful.
Learning by listening to something during your sleep doesn't work. Brains go into a sort of maintenance mode during sleep, and it's not possible for your brain to sleep and interpret & comprehend sensory input at the same time.
Most likely the noise will have a negative effect on the length and quality of your sleep, which does have a proven negative effect on memory.
So it's probably better for you to learn while your awake and just sleep at night.
Trevor Noah talking about how he learnt German.
https://youtu.be/2PWSJH02krs?t=56
So I started learning. I learned in different ways, you know - to watch German movies, play German speeches on my iPod when I sleep. Your brain remembers things you don't even know. It's beautiful.