Yea the ups and downs are much worse when snorted. My friend gave up snorting
them because of that reason. He felt great for about 30 minutes, then had a really strong urge to do another line.. then another.. then another. He doesn't have the greatest willpower in the world, but he prefers just eating them WAAAAAAAAAAAAY over insufflating them. Eating them gives you a much better buzz that lasts a HELL of a lot longer. But snorting them does get them out of you quicker he guesses. So if you have to sleep it would help you do that sooner. My friend can never really sleep on adderall
though, may be in my mind, or its just some strong shit.
His advice, don't waste your time or your pills by snorting them. unless you are going to be drinking. My friend likes to snort 30 mg's before he starts drinking and has quite the fun time.
Anyway, good luck.