The researchers also found that the clock usually peaks in activity during the early night, similar to the mother’s rhythm.

Humans and most other organisms have internal biological clocks that track the daily cycle of sunrise and sunset. These ...

Humans and most other organisms have internal biological clocks that track the daily cycle of sunrise and sunset. These ...

When does the circadian clock start ticking? A new study shows that fetal clocks synchronize to the mother in the womb via hormones, highlighting the importance of light and sleep during pregnancy.