Rebound?

Hi,

Just wondering if people experience the same thing:

I take Ritalin which is a miracle drug to me.  During the work week, when I am in my routine, I am fine - I take it at my scheculed times, and all is well.

But I have been noticing that if I don't take it right away on Saturday, I pretty much sleep all day.  Obviously, I need to stick to the normal routine on the weekends, but I was just wondering if people have experienced the same thing.  I am going on vacation this week to basically siot on the beach and relax, and was thinking of taking a "Ritalin vacation" as well, but now think it may not be such a good idea (the Ritalin vaca, not the vaca itself!). 

Any thoughts, etc., would be appreciated.

Thank you!