As an adjective vigilant
is watchful, especially for danger or disorder; alert; wary.
As a verb sane is
Watchful, especially for danger or disorder; alert; wary
- Be vigilant for signs of disease in your garden.
* watchful, alert, wary, aware, on the qui vive
Being in a healthy condition; not deranged; acting rationally.
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 mind
Rational; reasonable; sensible.
- a sane person
- Try to go to bed at a sane time before your exams.