"Interestingly, the NE group consisted of younger patients than the PVS, EEJ, and control groups. NEs are ejaculations and orgasms that occur during sleep. Although NEs can be experienced by men of all ages, they are most commonly experienced by young adolescents in the early years of puberty. The frequency of ejaculation by NE varies considerably between individuals and in one individual's lifetime. The highest frequency of NEs is between 16 and 30 years of age, which is consistent with our findings. This finding may be related to the strong sexual fantasies and sexual urges of young adolescents. Moreover, this result may be one of the reasons for higher semen quality from NEs. However, a large sample size is needed to further analyze whether the high semen quality from NEs is age related."