can i wear overnight my contact lens even it is disposable 3months?!

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only if ur not sleeping then, and disinfect them every 8 hours, if u wear them in ur sleep they dry up because ur eyes arent that tear-eashed in ur sleep because u dont blink.

my optician

I doubt it. Most of the contacts that are safe to sleep in are the newer silicone hydrogen materials, which typically are a two-week or a (one-)monthly disposable schedule; if you're wearing lenses that you buy a pair at a time and that last three months, they probably don't breathe well enough to let you sleep in them safely.
Easy way to find out -- call the place you got them from. We'd rather have you ask in advance than sleep in them and cause a problem.

I'm an optometrist.

you're not supposed to, but you can. if you do it too often you will feel like you have dry eyes in the morning - just put in some eyedrops and take them out that night.

no, your supposed to take them out before you go to bed.