biological clock

They could no longer set their biological clocks in response to light.

Maybe a little bit of the biological clock is ticking?

It means, she said, that "the biological clock gets turned back."

"My biological clock is running out," she announced one evening.

Many more genetic components of the biological clock are now known.

I'm beginning to think there must be a biological clock for grandmothers.

Light is the most powerful regulator of the biological clock.

With so many time zone shifts he had little idea what his own biological clock was doing.

My "biological clock" won't run down for another century or more yet!

And with female athletes, the question often involves the old biological clock.

When you have children, you get used to their biological clock.

"I could see what comes from settling for somebody or listening to your biological clock."

After all, their biological clocks are set to the rhythm of the seasons.

Does that thing about the biological clock ever get you to wondering?"

She made a face, annoyed at this possible evidence that her biological clock was trying to make its presence known.

"I mean, do you think someone could have a biological clock set for when they want to have children?"

I will even devise a means to roll back the biological clock to make the old young again.

It's the male equivalent of the biological clock ticking away.

Eighteen months ago very little was known about the genetics of biological clocks.

They seem to play a major role in setting biological clocks, he said, by detecting blue light.

There is no biological clock ticking or the desire to please parents.

The maple's biological clock is set by the timing of cold weather.

Diving around the planet can play hell with your biological clocks.

However, they are not what sets the biological clock.

Some, fighting the biological clock, find themselves thwarted by nature altogether.