Why 4 Hours Of Sleep Is Terrible For You — Even If You Don't Feel Tired

How much sleep do you really need? | Sleeping with Science, a TED series

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The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg

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What Happens If You ONLY SLEEP 4 Hours A Night for 30 Days?

I Can't Sleep for More Than 4 Hours a Night - Why? | This Morning

Can you sleep for just 4 hours a day ??

How to Sleep Less and Get More Out of Your Day- Thomas DeLauer

What Happens to Your Body on Little Sleep?

Yoga Guru - Hansaji | How many hours should you sleep?

How to Stop Waking Up in the Middle of the Night- 6 Ways to Beat Insomnia Without Medication

Sleep Hypnosis Deep Sleep Dreams 4 HOURS Long Play - Sleep Talk Down, Sleep Meditation

Insomnia: why can't I sleep?

I Decided to Sleep for 4 Hours a Day, See What Happened

This is how you can achieve PERFECT 100% sleep score every night.

Best and Worst Times to Sleep

Are naps actually good for us? | Sleeping with Science

Sleep Hypnosis Calm Your Mind 4 HOURS Long Play - Sleep Talk Down, Sleep Meditation

How lack of sleep affects health and tips for a good night's rest