In the hustle and bustle of daily life, sleep is often the first thing we sacrifice. However, sleep is essential for your brain to be healthy, alert, and balanced.
What happens in your brain while you sleep?
Sleep is an active biological process. While you sleep, your brain goes through five phases that repeat cyclically throughout the night, each time with longer and deeper periods.
It all begins with wakefulness, that moment when you lie down but are still awake. Then you enter non-REM sleep (rapid eye movement), which has three progressively deeper stages. Stage 3, the famous deep sleep, is when your heart rate, breathing, and muscles relax to the maximum. This is where cellular repair occurs, and when the brain consolidates what you have learned. If you don't reach this stage, you will wake up feeling tired, even if you have slept many hours.
The final phase is REM sleep, which appears approximately 90 minutes after falling asleep. In this stage, the brain becomes active almost as if you were awake: it processes information, stores memories, consolidates learning, and balances mood. Muscles are temporarily paralyzed so you don't act out your dreams while the brain does all this work.
To fully benefit from sleep, all phases are necessary, both REM and non-REM.
How much sleep do you need?
The amount of sleep varies with age. Most adults need between 7 and 8 hours per night. Newborns require between 16 and 18 hours; small children, between 11 and 12 hours; and teenagers, at least 10 hours daily.
Although it's common to believe that older adults need less sleep, science does not confirm this. What does change with age is sleep quality: we tend to spend less time in the deep sleep stage, and sleep patterns are altered.
What happens to your body and mind when you don't sleep well
Not getting enough sleep has real and measurable consequences:
- Fatigue and lack of energy during the day.
- Memory and concentration problems, because the brain did not process information correctly.
- Increased stress and anxiety: the body enters a constant state of alert.
- Irritability that affects personal relationships.
- Lower performance at work and in daily responsibilities.
- Long-term: increased risk of hypertension, heart disease, weakened immune system, and sleep disorders such as insomnia or apnea.
Sleeping well is also a form of rest
Many times we confuse sleeping with resting, and although they are related, they are not the same. Resting is a conscious pause during the day: it can be a walk, a short nap, a moment of stillness, or even breathing exercises. Sleeping, on the other hand, is the biological process that occurs at night and that no other activity can replace. Both are essential, but with distinct functions.
Tips to improve your sleep
Small changes in your routine can make a big difference:
- Keep your room dark, cool, and quiet.
- Use your bed only for sleeping.
- Establish a bedtime routine: a bath, reading, stretching, or meditation.
- Do a breathing exercise to slow down before sleeping.
- Avoid caffeine several hours before bed.
- If you've been awake in bed for more than 20 minutes, get up and do something relaxing until you feel sleepy.
- Don't stay in bed mentally solving problems.
Sleeping well is not a luxury or a sign of laziness. It is a fundamental biological necessity. Every night of restorative sleep is an investment in your health, your mood, your memory, and your productivity.
Are you getting the hours of sleep you need? Today is a good day to start prioritizing your sleep.