First of all, welcome to the forums! You can do a search on metadate CD. ( Search option is located at the top of the page on the right.) There are plenty of posts discussing this medication
My experience with it has been positive, however, after the first 5 hours, I got tired and my inattentiveness would kind of come in and out. So the solution for me personally was to add a second dose at lunchtime, at first, 10mgs was added but then I got tired and lazy around 5 when I should be cooking dinner, sigh... upped again to a second dose of 20mgs... It seems to do the trick.. I can go pretty well til around 8:00 with about an hour of tiredness around 4 -- but then I get over it and go on.
Dont know if your sleepy feelings are right when you take it or as it is slowly leaving your system. but since you wanted experiences -- that's mine
Sherry