Nocturnal Din is a term used to describe the sound of snoring, which is a common occurrence during sleep. SNORE, which has five letters, is the sound made when air passes through the relaxed throat and mouth during sleep. It is usually caused by the narrowing of the airways due to the relaxation of the muscles in the throat and mouth. Snoring can be disruptive to sleep and can lead to health problems such as sleep apnea.