Was tired by the time I got home, but didn’t go to sleep right away. Ended up getting a second wind of sorts, ended up going to bed late… like 3:30… laid there til 5. Gave up. Got up. Realized I hadnt eaten dinner. Ate a bowl of cereal. Went back to bed around 5:30, asleep around 6, slept til about 7:30, felt fairly awake but hit snooze button til 8:15. Got up, took pill and hopped in the shower. Not usually this awake in the morning, especially with this little sleep. Decided preference for upbeat music… listened to Dean Martin all the way in, pretty much skipping over everything but “Mambo Italiano,” “Standing on the Corner (Watching All the Girls Go By)”, “Ain’t that a kick in the head,” and “That’s Amore.”
Not nearly as hyper as yesterday, but I guess 90 minutes of sleep probably has something to do with that. Energy is coming more in spurts, not a constant. Of course, I took it 3 hours earlier today, too… so I guess 12:30 in the afternoon today is probably approximately equivalent to 3:30 yesterday.
Not buying that this stuff could keep you awake and functional for 48+ hours as some magazine articles have indicated. Well, not on the recommended dosage anyway, and I suppose being wide awake for 48+ hours is somewhat beyond recommended. 
So maybe.