I know my mood over the course of a day and so, it seems, does Twitter. Over the years there’s been a lot of work on mood cycles. Much of it has been based on neurochemicals such as serotonin and dopamine…

Sleeping is normally when our body sticks itself back together. Your breathing and your heart rate slow down, and gradually your body repairs itself, undoing all the damage you’ve done to yourself during…

Eyeless fish that have evolved underground, completely isolated from the day-night cycle, may offer clues to how our body clocks work up here on dry land. Authors of a report published today in the online…

Most people believe normal, healthy sleep should be long and uninterrupted from start to finish. Well, guess what? They’re wrong. This erroneous public perception of sleep was apparent in survey studies…

Feeling sluggish? Grouchy even? Difficulties getting out of bed? Mondayitis can happen to the best of us. But rest assured: it’s a phenomenon science can actually explain. In fact, there are a range of…

Do we control our body clocks or do those clocks, ticking imperceptibly, control us? It’s the kind of question that keeps sleep scientists awake at night. Rhythms are a good place to start. They are a…