Although so sleepy describes me at the moment, ( I think I am turning into a koala bear) and I have been known to sleep through hurricanes. I am seldom woken by the alarm even if it is set for an unusual time. Generally I wake five minutes before the alarm is set. I think we have an internal clock that we just no longer bother to tune into and use. It is easier if the time you wish to wake at coincides with the lightest phase of sleep (the last minutes of the 90 minute sleep cycle). It is the getting up rather than the waking up that is hard -- if I have to catch a plane or something I put the (external ) alarm on the other side of the room!
People have instinctive skills that we no longer use becasue we have technology. For example most men can tell which way North is without thinking - a relic of hunter gatherer days...
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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