What is the accuracy of wii fit body test?

[unknown...]

I get on at night then i burn about 132 calories, i get up in the morning without breakfast and it says i lost about 3.58 lbs.
Is this possible?
Is wii fit accurate?
i dont know if it matters but i weigh about 130 and im 5'3".

 

[Andrew B]

while sleeping your body sweats and burns calories so you are losing weight while you sleep.