"When daylight hours shorten or you’re indoors most of the day, your circadian rhythm weakens, making it easier to wake during lighter sleep stages — often around 3 am, when cortisol starts to rise,” ...

You may be feeling the lingering warmth in southern Michigan, but don't be fooled, leaves are beginning to change colors and fall is nearly here. The fall equinox, marking the season's formal ...

As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical (elongated circle) orbit that requires about 365 1/4 days to complete. The earth's spin axis is ...