It is obvious that if you lose good amount of money then you will have sleepless nights. I have not experienced it yet and I do not intend to in the future. I gamble with what I can spare. I always gamble with small amount and never exceed the limit.
For the Newbie yeah this is uncertain thats why may bring sleepless night but for the typical gamblers?losing Big amount is a normal thing and they are not bothered by this because their instincts telling them to try again next time so the chance of winning or recovering the funds is indeed(but of this is only their thoughts lol)Offcourse, no gambler will say that, he has not worried about their loose in the past. In the past, I suffered many lose which caused me serious sleepless night but was able to get out of the string.
In thispart you admitting many losses and sleepless nights but bellow .
That was the first time and the last time I experienced such thing. The problem here isn't the lose but greedily fellow who are not satisfied with their winnings during the game process, but later lost all their winnings back to the house.
How come that it becomes the First and the Last?very contradicting lol.
. I hope that some of the gamblers plan like I'm doing. Make a plan whenever you win and vice versa. 
This is my personal experience: I am a gambler who loves gambling mostly on sports betting and have had series of experiences which some a positive and others negative but for the purpose of this thread; I am going to talk about my negative experience. 
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, but that; the only time convenient for me to gamble is during weekends and sometimes into the night hours. This shouldn't be seen as any form of addiction on my part. Any gambler can choose to gamble with his time in as much its convenient. My reply was to a quote above you which said: those who gamble into the night hours are likely to be gambling addicts, and was just trying to prove a point.