People who go to bed at regular hour but wake up too early for their taste, are called early morning awakening insomnia.
The theory, if I am not mistaken, is that the early morning awakening insomnia people's body temperature graph and consequently their melatoning levels graph is flat, i.e. the difference between high peaks and low peaks is too low, therefore they either don't sleep deep or don't sleep long enough or both.
In this experiment they are trying to increase the difference between high and low by applying bright light therapy in the evening, just before going to sleep. Hm...
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Summary: If you are someone who can't fall asleep before 2-3-4 am, seemingly no matter what you do, you have delayed sleep-phase disorder, or DSPD. In my opinion this is a a condition that you have brought onto yourself by altering your sleep-clock to accommodate late sleeping. It normally starts in the winter and is worse in the wintertime.
I have a few students who have this issue and I'll do some experimentation with them, and will report back here...
Delayed sleep-phase disorder (DSPD), also known as delayed sleep-phase syndrome (DSPS) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder affecting the timing of sleep, peak period of alertness, the core body temperature rhythm, hormonal and other daily rhythms, compared to the general population and relative to societal requirements. People with DSPD generally fall asleep some hours after midnight and have difficulty waking up in the morning.
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