I was utterly EXHAUSTED for about 1 whole month. It was shocking how tired I was. I am not usually ever able to take mid-day naps, but after quitting I literally HAD to take mid-day naps. EVERY SINGLE DAY for a whole month or so.
I couldnt keep the fatigue at bay. Had to nap.
Whats weird in my case is that I regularly would go three weeks to a month of not drinking over the past 4 years, because of my job. I would sort of drink one month, and then not drink the next month (generally).
So, I can only surmise that I had finally signaled to by subconscious that I was truly quitting for good, and so my body said, "OH! Okay... in that case, we need to start to truly heal!" and it forced me to sleep so that i could heal.
Thats my theory anyway
But yes, its normal. Its ultimately a good sign, in my opinion.