Evening coffee has sparked controversy for years. Some people fall asleep without difficulty, while others toss and turn for half the night. However, a growing body of research suggests the question of whether coffee makes it harder to fall asleep may be too simplistic. What appears to matter far more is what happens in the brain during sleep.

Evening coffee has sparked controversy for years. Some people fall asleep without difficulty, while others toss and turn for half the night. However, a growing body of research…

Regular caffeine drinking can deprive the body of energy it needs for night-time rejuvenation – even if you don’t think you’ve woken in the night

Recent research finds that caffeine can reduce the time we spend in deep sleep, even if it goes unnoticed.