Why do guys get morning wood?

Although the science on this is hardly firm, the theories are most interesting. First of all let’s call Morning wood by its scientific name–nocturnal penile tumescence. It’s a perfectly natural occurrence experienced by healthy men 3-5 times a night regardless of what kind of dream they have. It is theorized that the body triggers NPT to stretch out the cavernosum (the two sponge-like regions that fill with blood to cause erection), something that helps prevent bed-wetting and erectile dysfunction.