So, there’s no exact way to hold a clinical test to prove that it’s the diaper that makes a baby sleep better. There’s are other factors like light, noise, dreams, hunger, etc. for this to be totally accurate. Diaper leaking affects baby's sleep. When it gets uncomfortable, they cry. here fore, you must choose a diaper with more absorbency so that the baby doesn’t feel the liquid and stays warm, dry, and sleeps peacefully.