Why does sleep matter so much? Many people do not realise how important it is for health and well-being. Regular lack of sleep is linked to high blood pressure, a weaker immune system and weight gain, and it affects mood, concentration and behaviour. Everyone should take it seriously and make the effort to get enough.
How much sleep do you need?
Most adults need at least seven hours a night, and many feel best with seven to nine. Teenagers need more, around eight to ten hours. Students are among the most sleep-deprived groups of all, thanks to early lectures, late nights and phones in bed.
Set up your bedroom for sleep
A quiet, tidy bedroom makes a real difference. Keep the room at a comfortable, slightly cool temperature and dim the lights in the hour before bed.
Watch what you drink
Caffeine can keep you awake for hours, so avoid coffee, energy drinks and strong tea in the afternoon and evening. Alcohol may make you drowsy, but it disrupts sleep later in the night. Many people find a caffeine-free herbal tea, such as chamomile, a relaxing part of a bedtime routine, and some like a little lavender scent on the pillow. The evidence for these is modest, but a calming routine itself helps.
Exercise regularly
Regular exercise helps you manage stress and fall asleep more easily. Aim for activity on most days, but try to finish hard workouts a few hours before bedtime. Ending a session with stretching and slow, deep breathing helps your body wind down.
Relax before bed
Simple relaxation or a few gentle yoga poses can calm the nervous system before sleep. Even five minutes of slow breathing while lying down can help you switch off.
Go to bed earlier, and put the screens away
Staying up late is one of the most common causes of sleep problems. Phones, laptops and TVs keep the brain alert, and the bright light from screens can delay the body's sleep signals. Try to stop using them for the hour before bed. That includes the "one more episode", the late-night group chat and the online game that is still running at 2 am.
Update (October 2026): Since this article was first published, research has strengthened the link between irregular sleep and poorer grades and mental health in students. The most effective habit is a consistent wake-up time, even at weekends. If you regularly struggle to sleep for weeks at a time, talk to a doctor or your campus health service: insomnia is common and treatable.
Why it matters
Lack of sleep is not only harmful to you. Tired people make mistakes, and some accidents on the road and at work are caused by fatigue. Research also links long-term sleep problems with heart disease. To stay healthy and safe, enough good-quality sleep is essential.