I wake up nightly to perform human-wastewater-relief duties (HWRD). (With that acronym, you can tell I do a lot of technical editing in the environmental field.) Typically two to three times per night. Could be more, could be less. Rare not to obey nature's mandates at least once nightly. But here's the strange thing. I walk into the bathroom with a guess in my head as to what time it is. Then I look up at the clock. (If I am extremely tired or have retired very late, I just don't look at the clock. It would freak me out too much to see how little I have slept.) Get this: invariably my guess of the time is accurate to within a few minutes! Oh, sometimes I'm off, maybe even by as much as an hour, but that's rare.
I have termed this phenomenon nocturnal chronognosia.
(Do I have the same uncanny ability during the day? Do I have diurnal chronognosia? I'd have to forgo the wearing or consulting of wristwatches, etc. to find out. Somehow diurnal chronognosia just does not seem as interesting.)