Waking at 3am every night? Here’s what may be going on

Brief awakenings are a normal part of sleep, but stress, alcohol, caffeine and irregular routines can make them harder to ...

Wondering if you’re a ‘light’ or ‘deep’ sleeper? The science isn’t that simple

If the slightest sound wakes you, you might wish you slept more deeply. But several factors shape how much shut-eye you get.