Why doesn't meth have an effect on swim?

[steve--]

Swim is not saying that it doesn't have any effect at all, but it does not effect swim in the same way it does most other people. As far as the sleep part goes, if swim uses starts using at about swim's normal bed time, it does make swim feel more alert, and more energetic, and will in fact keep swim awake for awhile, but about 10 - 14 hours later, not to long after swim would normally wake up, swim begins to get extremely tired and needs to sleep, even if swim is continuing to use right up until that point. On several occasions swim upon feeling very tired at this point has used a very large (but yet safe) amount of meth, to see if it would take the tiredness away, but it has failed each time. At this point swim just needs to sleep period.
As to do with appetite, for the first 3 hours or so after beginning to use, swim in fact does not have much of an appetite, even if swim was hungry pryor to using, but after that approximate 3 hour time frame swim begins to get hungry and needs to eat, even while continuing to use. And with this like with sleep, swim upon feeling hungry has tried using a large amount of meth to see if it would take swim's appetite away, but in this case it also would also fail on each attempt. Swim is rather disappointed in meth, as the reason why swim ever even tried meth in the first place was so that it could aid in losing weight. Now swim uses it only occasionally for recreation maybe 6-10 times a year.

I have two basic questions.
1.) Can anyone explain to me why this is?
2.) Does anyone else who reads this have the same problem? or do you know anyone else that is effected by meth in this way?

Thanks
Very Sincerely
Swim