Old thread, but I 100% have gotten paradoxical reactions to amphetamines and usually don't have any difficulty falling asleep on them.
yep, there have been times i have taken adderal and almost immediately crashed or felt very tired and just irritable..no clue what caused that type of efect but i didnt like it, at all...
caffeine is weird too, sometimes it just makes me sleepy, other times it just gives me a very lame boost of anxious energy for 20 minutes..garbage drug imo..