If you ever wake up mere minutes before your alarm, you can thank a hormone named adrenocorticotropin. It functions as your internal alarm, being released several hours prior to expected wake-up time. Scientists believe that the hormone is released to deal with the “stress” of waking up. We have conscious control over this hormone too. People who were told they would be woken at an early time had higher levels of the hormone. So telling yourself you need to wake up early might be enough to prime your internal alarm.
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