By 
Matt Walker
 | 
Original Content

How caffeine and alcohol affect your sleep

Caffeine wakes you up, and alcohol makes you nod off, right? It's not that simple. Sleep scientist Matt Walker takes us into the eye-opening ways that these drinks affect the quantity and quality of our sleep.

Related tags:

sleep
science
health
human body
TED is supported by ads and partners

Watch next

5:28
Luka Seamus Wright
The sharks that hunt in forests
3:35
Jen Gunter
Why healthy bones are about so much more than milk
5:07
Susan M. Reverby
Ugly History: The US syphilis experiment
5:02
Jen Gunter
What really happens to your body during menopause
4:03
Nina G. Jablonski
Why do we have hair in such random places?
4:11
Jen Gunter
Why you shouldn't worry about pooping once a day
4:25
Philip Renaud and Kenneth Kostel
Could you survive the real Twilight Zone?
4:53
Khalil Ramadi
Electronic pills that could transform how we treat disease
4:59
Alex Gendler
The woman who stared at the sun
5:19
Aaron Morris
The future diagnostic lab ... inside your body
5:56
Brittany Young
How dirt bikes and STEM ignite ingenuity in Baltimore
6:24
Katie Mack
The death of the universe -- and what it means for life
4:21
Jen Gunter
Why you don't need 8 glasses of water a day
5:02
Masako Tamaki
Can you be awake and asleep at the same time?
4:32
Marianne Schwarz
What causes migraines?
5:06
Amy Hrdina and Jesse Kroll
What's in the air you breathe?
4:43
Sara C. Mednick
How long should your naps be?
4:44
Rebecca J. Barthelmie and Sara C. Pryor
How do wind turbines work?