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Russell Foster is a circadian neuroscientist: He studies the sleep cycles of the brain. And he asks: What do we know about sleep? Not a lot, it turns out, for something we do with one-third of our lives.

In this talk, Foster shares three popular theories about why we sleep, busts some myths about how much sleep we need at different ages -- and hints at some bold new uses of sleep as a predictor of mental health.

New Study: Sleep Is Literally a Deep Clean for Your BrainSleep washes away toxic gunk that builds up in your brain. Do you really want to leave it there?

A common barrier to sleep is having a hard time switching off from thoughts. If you find it hard to switch off from worries and negative thinking you might find our worry resources helpful.

In order for sleep to happen, there needs to be deep relaxation. Focus on this first. Deep relaxation is very restorative. Sleep should follow, but if it doesn't, try not to worry too much as this will make you feel even more wide awake. Here are some tips that might help improve your sleep.

What can I do to fight fatigue while working night shifts? Firstly, don’t try to 'power through it'. Fatigue puts you, your colleagues and your patients at risk.

It’s common to have problems with sleep. This guide aims to help you:

• Recognise the symptoms of sleep problems
• Understand what sleep problems are, what causes them, and what keeps them going
• Find ways to manage sleep problems

Helping you manage your own health and wellbeing while looking after others.