The human body when kept in an indoor environment of low lux light will not realize that it is daytime, as it cannot sense the increasing levels of daylight that the genetics are accustomed to. As such, by late morning your body may start sending a signal for you to sleep!
sleep light humanity human-nature human morning humans body sense sleeping genetics senses human-being humanity-and-society body-and-mind environment environmentalism mornings light-and-darkness environmental-degradation daylight human-development environmental body-mind-spirit sleepy morning-people morning-person level increasing body-language morning-sun send outdoors outdoor daytime sending levels morning-quote increase signal senses-of-the-soul lights indoor body-of-christ indoors lux signals accustomed indoor-person signaling-the-day sleep-spells
The morning was a wretched time of day for him. He feared it and it never brought him any good. On no morning of his life had he ever been in good spirits nor done any good before midday, nor ever had a happy idea, nor devised any pleasure for himself or others. By degrees during the afternoon he warmed and became alive, and only towards evening, on his good days, was he productive active and sometimes, aglow with joy.