33
/fr/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
November 30, 2025
250456
22055
1
Create a timeline
Public Timelines
For educational institutions For teachers For students Cabinet
For educational institutions For teachers For students Open cabinet
FAQ
Create a timeline
Public timelines
FAQ
About & FeedbackUn accordConfidentialitéFAQ
Support 24/7  
CabinetGet premium
Donate

1 janv. 1850 - Sleep Substance

Description:

It was believed that sleep was caused by a kind of “sleep substance” or toxin that built up during the day and dissipated at night, or that sleep was regulated by blood flow, or that it was caused when nerve cells became paralyzed at night and unable to communicate with each other.

Ajouté au bande de temps:

Sleep Medicine

ByPardeep Masuta
8 nov. 2017
0
0
440

Date:

1 janv. 1850
Maintenaint
~ Il y a 175 ans
About & FeedbackUn accordConfidentialitéFAQ
Support 24/7  
CabinetGet premium
Donate
The service accepts bank transfer (ACH, Wire) or cards (Visa, MasterCard, etc). Processed by Stripe.
Secured with SSL