Slow wave or deep sleep is a stage in the sleep cycle necessary for proper brain function and memory. Most people need 7–9 hours of sleep per night, but working out how much deep sleep they need is ...

Now that we have wearables tracking our every move, a lot of us can look at stats that supposedly tell us how well we’ve slept the night before. But sometimes, it can feel like your sleep tracker is ...

Deep sleep is one of the most essential stages of the sleep cycle, playing a vital role in how well you feel both physically and mentally. Often referred to as slow-wave sleep or delta sleep, this ...