Some scientists think that temperature could be just as important as light at training the body's circadian clocks.
Dr Chris McCarthy talks through the four considerations you need to make before buying your pillow.
Hunter-gatherer communities are a window on how the human species learned to get a good night's rest. Here's what you can learn from them.
Why it's a good idea to get out for an evening stroll, and other essential sleep advice for students.
Scientists say it all depend on caffeine habits, lifestyle and one factor we have no control over: our genes.
Just two hours of extra sleep can help reverse the damage from a bad night. But early nights and lie-ins should be wielded with caution.
Millions of us do it, though few of us realise we do - but getting the right treatment can be life-changing.
Sleeping next to a snorer could be having a negative effect on your health, experts tell the BBC.
Can accidental detective John 'Ludwig' Taylor crack the biggest puzzle of his life – finding his missing brother?
