Nocturnal noise is a term used to describe any sound that is heard during the night, such as snoring. Snoring is a common type of nocturnal noise and is defined as a loud, hoarse sound made while sleeping due to vibration of the soft palate and uvula. It is usually caused by an obstruction in the airway, such as the tongue or throat muscles. The two crossword solutions for the term nocturnal noise are 'snoring' (7 letters) and 'SNORE' (5 letters).