This is the second time I've had to collect a 24 hour urine. The first time I filled 3,000ml container to the brim. This time I started at 5pm. It's currently 2am and I only have 200ml of space left in the container. I will have it more than filled by the time I've reached the 12 hour mark. Did anyone else have this? I do drink quite a bit, but I'm never forcing myself to drink. I'm just always thirsty. Is there an issue with too much urine output?