Yeah, I did a porter using Windsor yeast and it finished at 1.028 or so. The 'sweet' flavour does fade, but the beer farts do NOT. Let me tell you, I drank 2 in one night last week, and this is how my sleep went that night:
10 pm - Snoozing
12 am - loud fart which wakes me up
12:30 - woken up by the foul smell in my room. More farts.
1:30 am - Huge fart, wakes up wife. No fun times here.
1:00 am - Oh my god, I need an enema
2:00 am - Jebus, save me. I sure hope my houseplants can survive in such a high concentration of methane
3:00 am - fart fart fart fart fart
4:00 am - Ok, had enough gave up on sleep. Got up, tried to make the farts turn in to a number 2. No go, just ended up sweaty and frustrated.
6:30 am - Gas goes away, time to have a shower and get ready for work.
I have never been so tired at work in my life. I still have the beer, and 1 in a day does not keep me awake but I do not reccomend drinking more than that unless you have a spare colostomy bag.