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Anecdotal background

I find that regardless of what time I go to bed, or how exhausted I am, I always wake up the next morning between 5 and 6am. This is despite my alarm being consistently set for 6:15am. I used to work in an industry, over 15 years ago, where earlier morning starts were part of the job (started work at 6am then), but none quite as drastic since then. I do not take naps, either.

This happens irrespective of the conditions (temperature, etc).

So, I do not have a fixed time of sleep and it is not necessarily easy to get of bed at that time (some mornings here are very cold).

The question

What are the neurological triggers that cause someone to continually wake up at a set time in the morning, regardless of time of sleep and conditions?

Note - this not a self help question. I have read the questions and answers for "What defines the easiest time to get out of bed in the morning for humans?" and "How are people able to wake themselves up after a pre-specified amount of time?" and they did not quite have the answers I am after.

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The same happens with "hunger": If you eat at the same time each day, your body learns this rhythm and adapts to it, releasing the hormones etc. you need to digest shortly before the expected food intake, causing you to feel hungry about half an hour before your regular meal time. So what you really want to know is not the mechanism for waking up, which is the same no matter if you wake up regularly or irregularly, but about your biological clock and how that works. Because in a regular life style the normal phyisological mechanisms are triggered before the expected event. –  what Sep 21 '13 at 7:42
@what, yes, this kind of thing I am after a referenced answer to. –  user3554 Sep 21 '13 at 8:04
You might want to rephrase your question to attract the right kind of experts and instigate the right kind of research. Just using "biological clock waking up" in Google turns up a multitude of results, the first one being my answer below. –  what Sep 21 '13 at 8:29

1 Answer 1

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Thank you! That kind of article is what I am after - answers my question with bonus genetics and physiology. –  user3554 Sep 21 '13 at 12:53

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