Does an automatic shutoff energy saver light switch exist?

[Michael Balarama <mbalar@xxxxxxxxxxxxx>]

Does an automatic shutoff energy saver light switch exist?

My parents always yelled at us to shut off our lights constantly and now I
find myself constantly yelling at the kids to shut the lights off. I know
it's a losing cause.

Maybe there is a better way?

Do they have automatic-shut-off light switches I can simply remove and
replace my existing standard light switches is? Are they inexpensive enough
to be practical?

Better yet, do reasonably priced light switches exist that automatically
turn the lights on and off as you walk by? Do they also fit in the existing
light switch boxes?

Please advise.
Thanks