If learning is all the time, when do people sleep?

Some images are links. Evidence that unschoolers can sleep peacefully without enforced bedtimes:

The original page on Sleeping for unschoolers

Here's a newer page on co-sleeping, with research links: Co-Sleeping

Thoughts on Bedtime

Late Night Learning

Sleep theory, history, culture, comparison (Outside writings and ideas that might help people see sleep differently)

Link to an article on Sleep, TV and obesity, with commentary: Sleep, TV and obesity (probably not what you think)