Nocturnal emission is an ejaculation of semen experienced by a male during sleep. It is also called a "wet dream", a spontaneous orgasm, or simply an orgasm during sleep. Nocturnal emissions are most common during teenage and early adult years. However, nocturnal emissions may happen any time after puberty. They may be accompanied by erotic dreams, and the emission may happen without erection. Dreams, if recalled at all, may not be erotic, or they may be confusing to the dreamer, especially if he is an adolescent, immediately after his first wet dream. The sensations, if any, which accompany a wet dream may range anywhere from simply a tingling sensation to a sense of urinating or having to urinate, instead of the typical orgasm (which is why many teens might awaken in embarrassment believing they have just wet the bed). It is possible to wake up during, or to simply sleep through, the ejaculation in what is sometimes called a "sex dream'. Nocturnal emissions occur as a physical response to erotic dreams and as a mechanism to expel an abundance of sperm cells, which are constantly in production within the male individual. The discharge of semen through the penis during sleep usually as a result of erotic dreams is called nocturnal emission. It is also called “wet dreams” or “night falls”. When a young man experiences a nocturnal emission, he gets quite a shock. If the person is ignorant of the normal sexual process, he will be bewildered at what is happening to him and may turn to bogus literature on sex or to quacks for an answer. Misinformation may result in sexual problems. Wet dreams are quite natural. No physical or mental harm can come from them. They do not require any treatment. It is not just boys who get these wet dreams. Even girls and women can have erotic dreams as a result of pent-up sexual desires, which may lead to orgasms during sleep.