Night owls may be more prone to heart disease and diabetes, study finds

Research shows early birds more sensitive to insulin levels and burn more fat at rest and during exercise

Increase in LED lighting ‘risks harming human and animal health’

Transition to blue light radiation across Europe increases suppression of sleep hormone melatonin, say scientists

Scientists find out the best way to soothe a crying baby

Walking around, then sitting down and holding baby for up to eight minutes seems to be the most effective technique

‘Just tape your mouth shut!’ Can I unlearn the breathing habits of a lifetime?

The clock passed midnight as I lay awake, looking like a hostage. As a mouth breather, I longed to stop resembling a fairground clown

‘I just go into my head and enjoy it’: the people who can’t stop daydreaming

Psychiatrists may soon recognise ‘maladaptive daydreaming’ as a clinical disorder. But what is it, and how can it be treated?

Sleepless nights make people more selfish and asocial – study

Losing even one hour of rest reduces ‘innate desire of humans to help one another’, US research finds

The torments of sleeplessness, 1988

One in six of us didn’t get nearly enough – like Kafka and Kipling, among others. By Chris Hall

Can I catch up on lost sleep? We ask an expert

Prof Derk-Jan Dijk of the University of Surrey’s sleep research centre says you can … up to a point

Snoring was ruining my marriage – here’s how I finally cured myself

Fed up with being banished from the marital bed, I went on a desperate search for a remedy for my cacophonous snoring. Was the solution right under my nose?

Should I feel bad for still wanting to have sex now I am 87?

My wife and I have slept in separate bedrooms because of my snoring for 30 years. But I still want us to have sex – which she thinks is odd. Is she right?