I can attest to this and what I have read supports it (though it may not be the same for everyone) -- each time you quit drinking and then start again and then quit again the withdrawal becomes more intense. I've failed many times prior to seeking help (presently) and I seek help this time because the widthdrawal symptoms I experience this time when quitting where fairly severe - I haven't slept for more than a couple of hours with night sweating, massively high blood pressure, suddenly waking with the sensation of hundreds of nails flying at me, screwed up thoughts and that's to name a few issues.
The last time I quit I was a hard day followed by a sleepless night but the next day wasn't so hard. So I can only assume if I keep drinking I'm in for what amounts to agony during the nights and since I have to function during the day, it's likely sleep deprivation will devastate my relationships and my life will come undone which I'm not prepare to allow to happen.