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en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

Delayed sleep phase disorder (DSPD), more often known as delayed sleep phase syndrome .... Often people with DSPD manage only a few hours sleep per night during the working week, then compensate by .... a half-life of 15 hours, and taking it during the later part of the day can make it harder to fall asleep at bedtime.

www.7cups.com/qa-sleeping-well-20/why-do-i-have-trouble-sleeping-at-night-but-not-during-the-day-5721

What you can do yourself: try to sleep less during the day. set an alarm. the less you ... During the night, try listening to music as you fall asleep, but only calming ...

www.circadiansleepdisorders.org/docs/DSPS-QandA.php

Jul 15, 2017 ... An FAQ on Delayed Sleep Phase Disorder (DSPD), a neurological circadian ... sleep/wake cycle is delayed with respect to the external day/night cycle. ... They may be awakened, with difficulty, only to fall back to sleep again. ... Many people with DSPD feel rested and alert if they can sleep during the hours ...

www.circadiansleepdisorders.org/description.php

Jul 14, 2017 ... He still can't fall asleep until 4am, which means he only gets four hours of sleep. He feels very tired and sleepy during the day, but no matter ...

www.helpguide.org/articles/sleep/sleep-disorders-and-problems.htm

Learn the symptoms of common sleep disorders and how you can help yourself. ... feel irritable or sleepy during the day? have difficulty staying awake when ...

www.quora.com/Why-can-I-sleep-during-the-day-but-not-at-night

Your SCN (suprachiasmatic) clock is busted. Simply, your circadian rhythm has reversed to ... Most people pay little attention to eating, and a busy person may only consume food at the end of a long day prior to going to sleep. If this is moved  ...

www.alaskasleep.com/blog/sleep-disorders-causing-you-to-feel-tired-everyday

Oct 9, 2014 ... One that with continued lack of sleep can prove to be harmful to their ... Feeling excessively sleepy or having a general lack of energy during the day. ... Not only do sufferers of narcolepsy feel the need to sleep almost all of the ...

thechart.blogs.cnn.com/2010/11/30/get-some-sleep-night-owl-its-a-real-condition/comment-page-3

Nov 30, 2010 ... I am a night owl AND an introvert, so I not only have to conform to the ... one can only do in the day..a normal person who just gets sleepy and ...

www.healthboards.com/boards/sleep-disorders/188824-sleep-fine-during-day-but-not-night.html

Jul 9, 2004 ... At any time during the day (say 7am - 10pm)I can fall into a very deep, restful sleep... But after ... It says only take it when you can sleep 8 hours.