clear mind

Finally, the best way to realize a productive night of sleep is to have a clear mind.

I began the race with a completely clear mind, thinking about nothing but crossing the finish line.

I have nae clear mind about his coat,” said Alan cunningly; “but it sticks in my head that it was blue.

"He was a youth of noble disposition, clear mind, and a holy monk," 191 we are told.

The influence of his strong, deep, clear mind was powerfully aided by his engaging personality.

She lay looking up into the sky languidly, but with clear mind.

In Esperanto, provided you have a clear mind and know your grammar, you are right.