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If the child is not at rest during the day will inevitably go to bed, as the clock sleep disorder as adults.

Trying to catch up on sleep on the weekends can just push one's biological clock further out of whack.

Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal clocks.

If you are in a relationship that seems to be stagnating, your inner clock will likely begin to sound an alarm this month.

But on very overcast days those clock-shifted pigeons are just as good as normal pigeons in starting out in the right directions.

The salient issue, says study co-author Fred Turek, may be the disruption of the body's internal clock, known as the circadian rhythm.

I only arrived in London yesterday and my body clock is still on New York time.

biological time clock within them which causes them to run down in that capacity as they older.

Getting very little sleep during the week and trying to "catch up" on the weekends is not a good idea because it alters your sleep schedule.