Take the 2-minute tour ×  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 amou