hi, every guy has them.
but i am afraid that i might roll on my stomach
during having an erection at night and that my
penis might rupture/break this way.
don't laugh, this is possible.
what can i do to prevent this ?
It's highly unlikely you'd ever roll over and hurt it. So unlikely that you shouldn't worry about it. the main time people break their dicks is sex with somebody on top getting off it and missing the hole like that. and sitting down on it. very painful, so painful that if you started to do it asleep your body would stop you and you'd roll the other way.
And yes, jcking off 1,2,3,4,5 or 10 times a day is normal as long as you're not missing out on life or rubbing blisters. I average 1.5 a day or so.
I've been having night erections for about 50 years or so and all I can say is that if rolling around in bed could cause my penis to break I would have it in a permanent cast now. Don't worry about it. You also ask about masturbation: do it as much as you want as long as it doesn't get in the way of your enjoying other things in your life. It's normal and natural for younger guys to masturbate more than once, twice, or even three times a day. When I was 20 I could pop about 6 or 7 times a day.