Rapid Eye Movement (REM): The brain activity is almost identical to when we’re awake. In this stage, we dream.
Non Rapid Eye Movement (NREM): A dreamless sleep. During this stage, we’re calm, relaxed and the heart rate is slow and regular. There are four sub-stages of NREM Sleep: from 1 to 4, where 4 is the deepest form of sleep.
During REM sleep our body gets paralyzed by the brain in order to prevent us from executing on our dreams.
Sleeping helps us improve. When we’re learning or practicing something and we stop, our brain will continue to work on these tasks on the background. This passive learning process gets even stronger when we shut our eyes.
Sleep fuels our creativity. During sleep our brains build connections, nurturing our problem-solving skills and imagination.
The main function of dreaming is to help us resolve past, or current, emotional problems.
There is this thing called lucid dreaming where you’re completely aware of what you’re dreaming. In this state, you can manipulate the dream and decide what to do instead of simply going with the flow of the dream.
Since the temperature decreases when the sun sets, and for thousands of years we slept in the wilderness, you’ll fall asleep easier in a colder room
Consuming alcohol to persuade yourself to sleep is a bad practice. Alcoholic beverages mess up your REM sleep and you get a fragmented sleep.
With age, our sleep efficiency declines. This is mainly because of our frequent visits to the bathroom. A simple fix will be to reduce the intake of fluids before going to sleep.
Studies confirm that a lack of sleep can lead to a lot of nasty outcomes: diabetes, depression, chronic pain, stroke, cardiovascular disease, and Alzheimer’s disease.
You can’t sleep it off: Even if you get enough sleep to recover from last night’s party, the brain cells that have died during the sleep deprivation will never heal.
You start to gain weight if you don’t get enough sleep. This is caused by two hormones that are released in your body: leptin and ghrelin. In short, the imbalance between the two increases your level of hunger causing weight gain.
Your immune system is getting weaker when you’re sleeping less. On top of that, your libido also suffers.
"The best bridge between despair and hope is a good night’s sleep."