To have a nice goodnight bat after a long stressful day of being horny before going to sleep, just to get it out of ya system.

This is the most common form of stress relieving therapy.

Obligatory pre-sleep wank. The required wank which occurs just before one goes to sleep, usually to aid in falling asleep. The OPSW is usually done with free internet pornography, including but not limited to the free tour feature on most sites, amateur pages, and pre-teen myspace profiles.

Similar to think it over, but usually applies to matters relating to those of the opposite sex.
When unsure of weather to sleep with a girl, it is best to wank it over for the clarity of mind one recieves apres-orgasm.
You can then ponder the matter without hormones getting in the way of logic. Who may be hot when you are randy might actually be horrific, and you only see this after beating the bald bishop.
STDs, ugly features, weight problems or even gender may be overlooked pre-ejaculation.
This procedure can also be a good remedy for beer goggles syndrome.