Staying up late nights might feel productive, but it could be affecting your mental health in ways you don't realize.

(CNN)-- If you have a hard time crawling out of bed in the morning, it could be that your body is biologically programmed to start the day later. Experts say a spectrum of natural sleeping and ...

Night owls, for instance, generally feel tired later ... Turns out, it’s largely triggered by light signals that strike your eye. So, when you first wake up, get outside and soak up some morning ...

If you hear a screech owl in your neighborhood at night (hear their sounds here ... red tips on their flight feathers. Add a black eye-mask, taupe-colored plumage, head crest and sleek-looking ...

Proportionately enormous eyes contain many more rods and cones than yours do, and these uber-peepers allow the owl to see ...

Night owls, in particular, should not be shamed into ... Former PM Margaret Thatcher, for example, famously got by on about ...

There are some animals that only come out at night and they are called nocturnal animals. Woo. Woo! Who do you think these eyes belong to? Owls. Owls have big eyes to help them see in the dark.

And while getting the right amount of shut eye is important, the time of day you prefer to sleep also plays a role. Some prefer to wake early in the morning before the sun rises. Night owls on the ...