Anybody doing Agile/Scrum know how it deals with people issues? It seems like with these practices everyone is on a tight leash -- how does it deal with the fac

Anybody doing Agile/Scrum know how it deals with people issues? It seems like with these practices everyone is on a tight leash -- how does it deal with the fact that real people have a natural ebb and flow in their concentration levels at work or interest in work. If your are scrumming all the time, how do you get slow periods in your work cycle so you can recharge (aka slack-off :-))?