There seems to be a few different motivators driving this thread, so I'm going to share my 2 cents worth on a life time of what some might consider a hobby, others may label it social drinking, others might call it partying, others might label it as excess, and yet others might consider it an addiction.
Here are the signs of possible issues, where you might want to consider dialing it back a bit and reflecting on the motivation behind your passion for the vino:
If you're day drinking on days that aren't an actual special occasion. (these occasions should be countable on one or two hands, within any given year, no removal of shoes and counting on toes as well)
If you're finding yourself angry and/or fighting with loved ones on occasion while under the influence. Booze of any sort should be avoided completely, until the real issue is completely resolved.
If you're unable to cork up an unfinished bottle and save it for the next day, regardless of how early or late it is.
If you're waking up the next day, a bit hazy and forgetful of what you did the previous evening.
If you're over 7 years old, yet under 75, and have wet the bed.
If you're well past your 21st birthday and have thrown up due to excess drinking.
If you rely on arbitrary days on a calendar as motivation to help you "take a break" from your "hobby".
If you're past your mid 20's and still think being able to out-drink your friends makes you cool and/or admirable.
If you find yourself attempting to cure your daily boredom, or lack of motivation, by cracking open a bottle.
If you find yourself, unable to fall asleep at a regular hour without some liquid assistance.
If you find yourself making a list of potential alcohol related issues, caused by drinking excessive amounts of alcohol, on a website dedicated to helping you make the very best tasting alcohol.
I could go on, but I'd like to hear other people add to my list of "pointing out the obvious" since it's sometimes not so obvious to all of us at that particular time.
If it's just a hobby, embrace it and enjoy it, if it's a habit, correct it.