Part of it is definitely mental. If it wasn’t, things like the sound of running water wouldn’t affect you, but I think they affect everyone. If, for some reason, you started not peeing every time you got up, you probably wouldn’t always wake up feeling like you had to.
Would a medial issue be something in between? In the middle? In My Humble Intermediate Opinion?
Was it after you smoked two joints? 
No doubt. What pisses me off (heh), is I can go all day long and only have to pee once or twice. But that six hour stretch when I’m trying to sleep, it’s not uncommon for me to have to get up two or thee times.
Semi-hijack, but this one interests me. Up until I was ~30 I thought people who felt the urge to pee when they heard/saw/thought about running water were slightly nuts ;). I never had any such experience and found the idea kind of strange ( explicable intellectually, just strange ).
Another third of my life later and every time I go grab multiple sets of water samples at my job I feel a mild urge to use the bathroom. It’s weird :D. I’ve joined the rest of you odd people and I can’t figure out how and why it happened.
If you are a male 40 or older, have your doctor check your PSA. Frequent urination is a sign of prostate problems, including possible cancer. SInce prostate cancer is highly treatable in its earliest stages, the sooner that you know something, the better off you’ll be. It may only be an enlarged prostate and that can be treated with medications.
If you are a female (or a younger male) it may due to changes caused taking a new type of medication.Again, talking with your doctor can give you a sign of whether or not your bladder is being affected by a certain medications.
Oddly, I have the same problem monstro does. I have been searching for a solution for ten years now. For reference, I’m a male.
When this started I had to go to the bathroom every 2-3 hours. I went to a doctor, who after doing the necessary tests (diabetes, prostate, etc.) said the problem was psychological. The brain controls when to signal discomfort in your bladder to urge you to pee, and my brain’s bladder controlling abilities have malfunctioned apparently. It was urging me to pee when there was little or no urine in my bladder.
He told me to practice holding it in as a solution. His solution was too difficult to accomplish, so I went to another doctor. The second doctor, after conducting more invasive and uncomfortable tests, told me the problem was psychological. He told me that I should practice holding it in.
I tried harder to hold it in this second time around, but still failed to accomplish anything. Over the next five years I simply planned my life around going to the bathroom every 2-3 hours. This was severely frustrating, and after a few close calls of almost pissing in my pants in public, I decided to go to a third doctor.
More invasive and uncomfortable tests were done - more invasive and more uncomfortable than the tests performed by the second doctor even. The problem, the third doctor said, was psychological. He told me I should practice holding it. However, this time around he prescribed new drugs that would help me control my bladder.
Third time around holding it in worked (with the help of the new drugs, of course). Now I go to the bathroom every 4 hours, except for once a day when I go every two hours. When I go to the bathroom from around 10am-12noon, I have to go again after two hours. I’m fine for all other time periods except for this weird afternoon period. A solution still evades me.
If this is what’s happening, then shouldn’t it happen every time the OP goes to pee? She only complained about this happening “sometimes” according to her thread title.
Not necessarily, the pressure in the bladder isn’t the only factor determining how often or how much you urinate, fluid intake and excretion other than urination would be the greatest factors. But the OP may be encountering something altogether different also, perhaps just the amount of fluids drunk at different times, or as suggested, something entirely psychological.
I have the same issue as monstro, and we’re both female and I think around the same age. I get woken up before my wake-up time with a strong urge to pee. I pee, then get up a couple hours later and have to pee again.
I’ve always always always had to pee first thing in the morning. The “wake me from sleep” thing has been happening for about a year. I wouldn’t consider myself having to pee “too often” during the day - I just have this weird two-hour thing in the morning.
I just chalk it up to getting older. Not necessarily “old” just older. And yes I feel that having to pee when I wake up, two hours after I just peed, is psychological. It’s very much a part of my morning routine.
monstro, I don’t know how old you are but could it be related to menopause? Or as Zipper puts it, getting older. 
After a few years of issues and seeing some Urology Specialists and several useless drugs i have tried to live with my issues.
Well my job is driving a Bus and I was very close to hanging up this job because some Photo Finishes were won, not by me 
So another trip to the Doc and this time he prescribed “Tolterodine” (Detrol).
Well after filling the script and then reading all the side effects there was no way i wanted to go that route!
I decided to try another and i cannot attribute the idea from anyone other than God, but what i did is STOP all carbonated beverages. I drink Water and iced tea even though I never liked tea and still not that fond of it but I seem to need something,
Anyway today when i get back in from a long buss route I can even fuel the bus before visiting the washroom!!! Its only been a few weeks but I am Big Time Happy!!!
I do the same thing - have to pee again two hours after waking, but never really thought about it because it fits my morning routine. I figured it was driven more by convenience than something physiological. I get up, pee, walk the dogs and then get ready for work. All that takes about two hours. Last thing I do before leaving is shower and dress, so I am in the bathroom anyway with running water and the urge hitting me at that moment doesn’t seem at all strange.
Now I have to pee. Thanks. 