Bodies and minds need breaks or the work suffers, this has been proven and reproven to the point where we don't even need to post links to support it.
Carolyn HaxI have no quarrel with people who lack the skill or temperament to care for small children.
Carolyn HaxFor me, the greatest source of frustration was trying to work with a willful child when there was something else I wanted - say, to get the child to go to bed so I could have my own time. Just the promise of the time, and feeling that promise slip away, was enough to introduce a whole other element of stress into the encounter.
Carolyn Hax