FT260 / FT262

I frequently undergo periods of repeatedly waking up during the night at a specific time, something I can’t attribute to external factors. It is hard to believe that there is any noise that could occur with such metronomic regularity (e.g. nobody has a milkman that arrives at precisely 4:24am for a number of consecut­ive nights – approximately 4:25 maybe – but exactly 4:24?). As the example of 4:24 suggests, this would not appear to be from an electronic source (e.g. heating) as that wouldn’t be coming on until about an hour and a half later. Perhaps the oddest part is that though I sometimes check the time as soon as I wake up and at other times don’t look at the clock for 5–10 minutes, the time is always the same.