What to expect from medication? | ADHD Information

I am on the second day of Ritalin. The first day i felt like i was speedy
but my head was quiet for the first time in my life. I found that strange.
I could not sleep very well. Today i feel at ease like i can concentrate.
I do not feel speedy which is nice i did not like that feeling at all. I also
did some study work which i have been meaning to finish since
september hurrah at last. But did it in 3 hours i sat and did not move
for three hour amazing or normal? It would be nice to know what i
should expect. I am a little worried i might never sleep again. I am a
person who goes to bed very very happy i even giggle at the thought
of bed and sleep. What do other do about this?