Having a lie-in at the weekend could raise the risk of diabetes and heart disease, say researchers.
Some sleepwalkers are so immune to pain that they can fall and break a leg but still not wake up, researchers say.
Seth Porges looks at why so many of us struggle to sleep soundly and wake up refreshed.
Millions of adults get five hours' sleep a night at most, it emerged recently.
People in technologically primitive cultures get no more sleep than the rest of us, research shows.
Three couples whose marriages are under pressure because of snoring tell Sadie Nicholas their bedtime stories.
Sleeping well helps the body 'remember' how to fight infections, researchers believe.
Barbara Moffet has trouble sleeping - so her doctor sends her off to a sleep lab.
Children who have trouble sleeping are more likely to develop mental health problems, researchers warned recently.
Some experts now see a good night's sleep as the 'third pillar' of health.
The latest must-have for the super-rich is to have a separate 'snoring room' to which they can banish their noisy partner.
Drinking strong coffee in the evening can fool our body into thinking we are in a completely different time zone.
Researchers say we snooze better when we have access to nature, whether it is a beach, a park or a nice view.
Simmy Richman says theories about sleep are all very well - but there is the real world to contend with.
Teenagers can lose as much sleep each week as doctors who work 24-hour shifts.