Sleep deprivation

Whether it's reading a book or putting on music, many of us have some kind of ritual – small or large – that we do to "wind down" in bed. But it can be hard to gauge how good or bad these activities are. Now for one popular pastime, we know more.

Skipping one night of sleep causes healthy adults to see a spike in immune cells linked to chronic inflammation, a key feature of obesity, according to new research. It highlights the powerful link between sleep and immune health.