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blog.fitbit.com/sleep-stages-explained

On average, light sleep will take up about 50 to 60 percent or more of your night. “ Whether you get more or less light sleep isn’t really going to affect how you feel too much, because it’s just whatever time is left that’s not spent in deep sleep or REM,” says Grandner. “It’s sort of the remainder.”

www.newhealthadvisor.com/How-Much-Deep-Sleep-Do-You-Need.html

How Many Hours of Deep Sleep Does One Need? In today's highly demanding work environment, it is quite normal to cut back on sleep to achieve your career goals. A common notion is that you will miss out on opportunities if you give sleep much importance in your life.

www.tuck.com/light-sleep

Sleep inertia is less severe when awakening from light sleep than from REM or deep sleep. Patterns. Babies spend hardly any time in light sleep. Sleep spindles that characterize Stage 2 sleep first show in EEGs when a baby is 6-8 weeks old. As the child grows, more of his or her night is spent in light sleep.

www.areyou-sleeping.com/SleepCycle.html

The normal sleep cycle is 90 minutes long and is made up of light sleep, Delta or deep sleep and REM or dream sleep. The Sleep Cycle. While sleep is still largely an uncharted zone, a few things are known about the normal human sleep cycle: ...

www.medicaldaily.com/how-much-deep-sleep-optimal-and-how...

After two stages of light sleep in which the body is drifting and transitioning into dormancy, deep sleep arrives. This third stage of sleep comes with the slow brain waves known as delta waves and the eyes and muscles do not move. People in deep sleep are difficult to wake up. The way to get more deep sleep is to improve sleep in general.

www.ninds.nih.gov/.../Understanding-Sleep

During this short period (lasting several minutes) of relatively light sleep, your heartbeat, breathing, and eye movements slow, and your muscles relax with occasional twitches. Your brain waves begin to slow from their daytime wakefulness patterns. Stage 2 non-REM sleep is a period of light sleep before you enter deeper sleep. Your heartbeat ...

blog.addapp.io/2018/06/07/deep-sleep-much-need

The amount of deep sleep I was getting immediately caught my eye. Here’s the data from one of the first nights: Straight away I noticed that deep sleep was just 30% of my overall sleep. It seemed too little to me and while this was my worst night, my deep sleep never climbed above 38%. So I started wondering: How much deep sleep should I get ...

www.webmd.com/sleep-disorders/guide/sleep-101

Stage 2: You are in light sleep. Your heart rate slows and your body temperature drops. Your body is getting ready for deep sleep. Stages 3: This is the deep sleep stage. It's harder to rouse you ...

www.sleephealth.org/sleep-health

In adults, about three-fifths of a night’s sleep is light non-REM sleep, one-fifth is deep non-REM sleep, and one-fifth is REM sleep. Infants and children require much more sleep than adults and much more of their sleeping time is devoted to REM sleep. Whether sleep is healthy or not is at least partly within the sleeper’s control.

www.zenhaven.com/blog/what-is-deep-sleep-and-do-you-need...

I am 75 yrs old,and in tracking my sleep from fitbit i am averaging only about 1 hr. of deep sleep, 45 min. of REM,and 6 hrs. of light sleep.Is this normal for my age.