To prevent nightime ejaculation

For some a closed hole means night time ejaculation can  be painful as there is nowhere for the cum to go and it ends of bursting something when your penis muscles contract to get the cum out.  This happened to to me.  It will then take time for the penis to repair whatever was broken - which you dont want. . I found a way to prevent it though.

1)Have a cold shower before bedtime.  It must be cold as your body gets steadily warmer and so you must disperse this heat.  This will cool the hotness and the horniness.
2)Do not think sexy thoughts before bed.
3)If you wake up in the middle of the night, don't go back to sleep.  So for instance, if you go to bed at say 10pm and wake up at 4am, do not go back to sleep.  From my own experience, I noticed you usually ejaculate on these "second sleeps" rather than the deeper first sleeps.  I'd advise to read a book, watch tv or listen to music.  Avoid earphones as they can damage your hearing and cause tinnitus (a constant ringing).