Of course, it doesn't mean that you can sleep for less time and be perfectly healthy. There is lack of strong evidence to prove the relationship between sleep and perfect health, since other factors play a major role regarding health, apart from sleep.
Breathing pauses between snores leads to reduced blood oxygen levels and heart problems. Frequent snoring affects sleep quality, which in turn affects the secretion of the growth hormone, leading to obesity.
It's not going to restore your lost sleep, energy, or performance level. The body is a machine which functions in a particular way, and not the way you want it to. There's no fixed rule stating that more/less sleep is healthier.
You may fall asleep quicker, but the activity takes a toll on your brain, and eventually results in wakefulness.
Insomnia can happen to anyone, not just to people who have depression or anxiety, contrary to popular belief. It could be a symptom of a sleep disorder, psychological problems, or any other health problem, and is very much treatable. And, this doesn't mean that insomniacs need drugs every night.
Daytime naps have no effect on nighttime sleep. Nor does it mean that the person is lazy. Also, sleeping during the day does not mean that the person cannot sleep at night; you could sleep peacefully all night and still nap during the day. Only if the nap exceeds 30 minutes and is done frequently, should it be considered a sign of sleep disorder.
Interrupted sleep interferes with your metabolism and impairs the body's ability to burn calories. Insufficient sleep (as per individual requirement of course) causes the immune system to use less insulin, and may lead to diabetes.
As we age, the internal circadian rhythms undergo changes. This may be the reason why some older people sleep less. But everyone has different sleep patterns that are likely to change with age. It doesn't indicate that we sleep less as we age.
The reality couldn't be further from this myth. When you sleep, your body rests, but your brain is highly active and controls all the body functions. Especially during the REM (rapid eye movement) phase of sleep, the brain analyzes and consolidates facts, events, etc., and stores them in long-term memory.
Learning before sleeping further stimulates brain activity and aids cognitive functioning.
If you cannot get sound sleep after 15 minutes of staying awake, do not go back to bed. Engage in some other activity, and sleep only when you are too tired to continue further.
Contrary to the myth that dreaming serves no purpose, research shows that dreams have a significant part to play in our day-to-day functioning, and may impact our psychological health as well.