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

How to deal with your insomnia — and finally get to sleep | Sleeping with Science

English Phrases to talk about Sleep – Free Spoken English lesson

Best and Worst Times to Sleep

The benefits of a good night's sleep - Shai Marcu

How Sleep Affects Your Brain

Why Humans Are Supposed to Sleep in Two 4-Hour Phases

Learn Medical Vocabulary in English While You Sleep | 8 Hours of Listening Practice | Relaxation

Learn Common Sleep Vocabulary in English | British vs. American Terms

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

Why some people can thrive on less sleep – BBC REEL

What Would Happen if You Only Got 5 Hours of Sleep Per Night - NOT GOOD!

Sleep deprivation and memory problems | Robbert Havekes | TEDxDenHelder

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

Learn Polish while you Sleep! For Beginners! Learn Polish words & phrases while sleeping!

How to Sleep Less & Sleep Better

Learn Dutch while you Sleep! For Beginners! Learn Dutch words & phrases while sleeping!

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

Spanish Conversation: Learn while you Sleep with 2000 words

Insomnia: why can't I sleep?