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en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

Delayed sleep phase disorder (DSPD), also known as delayed sleep phase syndrome or .... Often people with DSPD manage only a few hours sleep per night during the working week, then compensate by .... with 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.circadiansleepdisorders.org/docs/DSPS-QandA.php

Aug 9, 2016 ... An FAQ on Delayed Sleep Phase Disorder (DSPD), a neurological ... sleep/wake cycle is delayed with respect to the external day/night ... They may be awakened, with difficulty, only to fall back to sleep ... Many people with DSPD feel rested and alert if they can sleep during the hours their bodies require.

www.circadiansleepdisorders.org/description.php

Aug 9, 2016 ... 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.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 ...

www.quora.com/It-is-easier-for-me-to-sleep-during-the-day-rather-than-at-night-What-should-I-do

It depends on when you started having the problem. If it is a recent problem it could be a ... Can you say that you have always had a preference for a late sleeping time? Particularly, have you found that there is a ... What happens if I don't sleep during nights and only sleeps during day time? Biologically, is there a difference ...

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

Nov 30, 2010 ... Often, they will steal a nap, but that only sets them up for further delay in their bedtime. ... Delayed sleep phase can be associated with depressive symptoms but the .... Nap when she naps during the day, as much as possible.

www.psychforums.com/insomnia/topic99361.html

I can't believe its actually come down to this. I need to be up during the day, but i' m to SCARED to sleep at night. Even nightlights don't help, ...

ask.metafilter.com/177828/Cant-sleep-without-daytime

She is in her early 30s and can't usually sleep at night unless she's past ... since it seems i can only sleep comfortably during the day no matter ...

www.end-your-sleep-deprivation.com/delayed-sleep-phase-syndrome.html

What delayed sleep phase syndrome looks like in the day. ... Low clock- dependent alerting in the afternoon causes them to be tired during parts of the ..... with sleep and fatigue as long as I can remember, but it's only been for the last 7 years ...