The best solution is to pee before you go to sleep, and then you won't be tempted to go during the night either.
Once you wake up, you won't be tempted to go as bad and have strange things like you had happen again.

P.S. You must have some crazy dreams, to get a boner when you wake up.

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" Nothing is a waste of time, if
you use the experience wisely. "
=> Auguste Rodin