You all know the rules, I'm sure. If not, see: See me once, see me twice
See me once and I can act
See me twice and I can nap
See me once and I'm on a scale
See me twice and life I have failed
See me once and you will accomplish the thing
See me twice and listen to them sing
I think the answer is
Do
See me once and I can act
Do - verb meaning to perform an action.
See me twice and I can nap
I think dodo is another name for a baby's pacifier.
Edit: there is also "fais do-do" originating from a mother's gentle command to get their child to sleep.
See me once and I'm on a scale
See me twice and life I have failed
Dodo - the extinct bird
See me once and you will accomplish the thing
Do - can mean to achieve or complete.
See me twice and listen to them sing
Dodo - not sure about this one but possibly the song of the extinct bird.
Could also possibly be referring to The Dodos
Are you:
LA
See me once and I can act
L.A. - Los Angeles, Hollywood - full of actors
See me twice and I can nap
La la land (note, it's also a movie!)
See me once and I'm on a scale
La weight loss diet plan?
See me twice and life I have failed
unsure
See me once and you will accomplish the thing
unsure
See me twice and listen to them sing
Singing is often represented as "La la!"
