A Perth mother who murdered her husband as he slept and stabbed two of her children at their home in 2015 - in what a judge described as a brutal and savage crime - has been jailed for life.

Cara Lee Hall, 39, killed her 33-year-old husband Glenn Hall at their Leda home south of Perth, by stabbing him at least 16 times while he was asleep in the lounge.

Three of the stab wounds penetrated his heart.

The children sustained knife wounds to their arms, chest and hands before they fled to a neighbour's house.