accustomed body body-and-mind body-language body-mind-spirit body-of-christ daylight daytime environment environmental environmental-degradation environmentalism genetics human human-being human-development human-nature humanity humanity-and-society humans increase increasing indoor indoor-person indoors level levels light light-and-darkness lights lux morning morning-people morning-person morning-quote morning-sun mornings outdoor outdoors send sending sense senses senses-of-the-soul signal signaling-the-day signals sleep sleep-spells sleeping sleepy