A "night diaper" refers to a type of diaper that is designed to be used during the night. It is generally more absorbent than regular diapers, to prevent leaks and keep babies comfortable while sleeping. Full definition
This item may be convenient for late night diaper changing but for the long run, I wouldn't recommend it. (stressfreemommies.com)
Trial and error will be the best way to decide what works best for you; this is especially true of night diapering. (thinking-about-cloth-diapers.com)
However, chances are you did find a few brands that didn't work for you, resulting in late night diaper changes or early morning sheet changes! (earlymomentsmatter.org)