The 24-hour darkness during the winter near the Poles can disrupt sleep – this is how the people who live there cope.

Many children become afraid of sleeping in the dark - usually from the age of three upwards - so this fear in itself is not unusual in your daughter. It can be sparked off by a scary story or ...

You stare in the dark at the numbers glaring back at you on your alarm clock. It is 3 a.m., and the makings of another night of interrupted sleep and frustration are apparent. As you contemplate ...

The SCN then activates certain hormones, alters your body temperature, and regulates your metabolism to keep you alert or draw you to sleep. Although light and dark have the most significant ...

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