Meaning

• Being in a healthy condition; not deranged; thinking rationally.

  "a sane mind"

• Mentally sound; possessing a rational mind; having the mental faculties in such condition as to be able to anticipate and judge the effect of one's actions in an ordinary manner.

  "a sane person"

• Rational; reasonable; sensible.

  "Try to go to bed at a sane time before your exams."