Lecture 2 - What Is Sleep For

Question 1

What experiment was carried out in jellyfish to show that they sleep?

Answer 1

Jellyfish still onto the flat surface of jar
Lift up jar causing them to float
When they begin flapping = responsiveness
Keep jellyfish awake
See sleep rebound
Consistent with sleep requirements

Question 2

How do ostriches sleep?

Answer 2

Heads nod down in REM- muscle atonia
Go through cycles quickly
In vulnerable position therefore cycle through quickly so can continually monitor environment

Question 3

Huber et al 2004

What activity in the brain was seen after a motor learning task before sleep

Answer 3

Slow wave activity increased locally over contralateral motor cortex during sleep
Performance improvement following sleep was correlated with increase in SWA
Brain region has increased drive to sleep if used during the day