The term "wet dream" typically refers to a spontaneous ejaculation or orgasm during sleep, usually happening at night. These events are more formally known as nocturnal emissions. They are quite common in males, especially during puberty and young adulthood, as a result of hormonal changes and sexual development.
While it's much more typical for wet dreams to occur during sleep at night, it is technically possible for them to happen during the day. If someone has been sexually aroused and their body experiences a buildup of sexual tension, an ejaculation might occur during waking hours as well. However, daytime wet dreams are relatively rare compared to those that happen during sleep.
If you are experiencing any concerns or questions related to sexual health or reproductive matters, it's always a good idea to consult a healthcare professional who can provide personalized advice and guidance.