My rule of thumb if you eat a healthy meal, you're able to reward yourself with some sweets.  i.e. 
something like this, eat a chicken breast + fruit + vegetables + rice + water = Cookies for dessert. 
Or, if you've had a hard workout, you can reward yourself to some sweets. Rewarding yourself is a good thing, keeps fun in life.  Sometimes, strict dieting (i.e. no sweets) may bring you down.  Live a little
However, I only say this because I personally lost 50 lbs. and then started to gain muscle.  Same as you.  I don't focus on losing weight anymore, I focus on gaining bulk/mass/muscle.   
If we were both fat again, I would recommend no sweets but we are skinny! lol  :winning:
Re: Alcohol
You still drinking 1 day of the week? That's awesome.  I'm still drinking 2 days of the week and then feel guilty come Monday.  I drink on Friday and Saturday night's only.  I drink heavy, exotic beer that's loaded with alcohol, sugars, and carbs.  
I need to become like you and only drink once a week, choose Saturday night to get wasted 
My personal trainer actually advises me to drink both nights. Beer is my hobby and I enjoy drinking and hanging out.  She says if I maintain a 5-day exercise schedule (Monday - Friday) that also includes eating healthy that I should reward myself to beer on the weekends.  Reward myself and live life. 
_________
Cool weight loss and muscle gain dude.  I'm really impressed with the weight loss.  You became a skinny ass dude!
 I prefer you with some meat on you.. with some muscle :thumbup: