hah you are totally weird! But thats okay, im really weird to0 and not just because weed makes me hyper lol
Amphetamines do the same thing to me at certain doses, usually when the dose is to low. A little while after taking it, i feel really tired and lethargic. Although opiates definitely effect me, but they're not something i particularly enjoy that much.

On several occasions in the past i have taken short release dextroamphetamine tablets and lied down for a few minutes until they kicked in, only to fall asleep 10 or 15 minutes later, and i would have the strangest dreams.
They all had one recurring theme: i could not wake up. The effort it took to get out of bed was harder than going into work at 6:30 after pulling an all nighter and passing out at 4 lol
I would dream over and over (all of them false awakenings) that i would finally drag myself out of bed and start walking around the room, but i was so tired that i literally stumbled around the room as if i was drunk, and could not even see straight, my eyes would just roll around and i would eventually collapse back into my bed only to try to wake up again, and have the same thing happen.
It was extremely unpleasant and confusing, and i dreamt of nothing else for almost two hours. Every time i have fallen asleep on amphetamines i have had these dreams. I usually wake up feeling more tired than i did before i went to sleep.