Nightfall or wet dreams occur due to several causes and are usually harmless. The problem usually settles down with age, but if it occurs very frequently then it could be a cause for concern.
- It most commonly occurs due to the prolonged absence or lack of sexual activity. Since sperms are continuously being formed after puberty, the excess accumulated sperm within the testes is released via nightfall.
- Watching too much sexually explicit content, pornography or discussing too much sex can cause nightfall in young boys and men.
- Excessive stimulation of the genitals by rubbing against bedclothes or sheets during sleep may result in erection and involuntary ejaculation.
- Inadequate ejaculation during sexual activity due to weak genital nerves may result in accumulation of semen which may be released as nightfall
- Going to bed with the full urinary bladder at night.