Before electricity, humans naturally slept in two phases, waking for an hour or two around midnight for quiet activities.

Historical evidence reveals that humans once slept in two nightly phases, a practice now vanished due to modern lighting and ...

A bear broke into a Boulder home twice early Wednesday morning, leaving crumbs of evidence behind. And Denver7 got to hear ...

Artificial lighting and fixed workdays compressed our nights into one stretch. As cities brightened and clocks ruled, “first ...

Spending a whole day in the parks? These are the Disney World rides worth riding twice – both day and night. When you’re ...