One is supposed to learn from the mistakes he has done and make sure that those mistakes will never be repeated again. However, let me ask you a question: How many times did you actually do that? How many times have you looked in the past, acknowledge what you have done wrong and decide not to repeat that action ever again?
I don’t know about you guys, but this is how it goes out for me: I make a mistake, I suffer the consequences, I transfer my point of view from subjective to objective, promise myself that I will take care from that point on, time passes by and I’m back to square one, forgetting about the mistake I had done and I attempt to take another shot at the same action, hoping for a miracle. It never happens though.
Whenever you lose someone you care about forever (as in passing away), you promise yourself that from that day on, you will always show the people you care about just how much you love them. And you do that, for a while. You actually are a better person who shows his affection the way he should have always done. But then… You forget. You forget how it all started, forget to talk the nice way you used to talk, forget to notice all the signs that you should notice and all you are left with are the regrets. Regrets that maybe somehow, someway, you could have done something about it.
I know I have said that life is funny or boring but I love life. I love breathing, eating, drinking, loving and struggling to wake up in the morning to go to school. My love towards life is tending to be on a downward path for the past year though. Don’t receive that sentence as a suicidal one ffs, I’m just saying that being alone is not really something that you should be looking for in this life.
Perceive this any way you want: Value the people you love, cherish the ones that love you and don’t miss any day of your life cause.. well, you know.. life’s too short to spend it alone.

My way of seeing this issue:
There are mistakes from which you learn things (eg. being late at school a few times lets you learn how to construct your morning schedule). BUT (a big, capitalized but) there are some mistakes that occur either because we don’t live in an eutopian world (eg. break-ups and other love issues), either because it is just really really hard to change (eg. not procrastinating when work needs to be done).
Either way, these mistakes create small events in the human life, they create memories. Without them you wouldn’t have a character or wisdom to pass on to others (who will likely ignore you and end up learning things on their own skin).
So, to sum all that up, I believe that mistakes (of any kind) constitute (in a larger or smaller way) life experiences.
P.S. This comment is also written at night, by a person who can’t sleep too.
@ Manuel: I agree with you. After all, mistakes, like many other things, define us as human beings.
mistakes are life experiences but still, if you don’t learn from them, they don’t deserve to be called experiences.
Sleeping at noon, working and watching movies at night, that’s the usual schedule for a foreign student in Aarhus. Take care with the neighbors though, they don’t really appreciate loud sounds at night, as I learned the hard way
As for the post scriptum, you’ll get used to it pretty soon
@Victor: Rough sex in your dorm rooms?:P