Stumbled across this on Amazon today...honestly they sell pretty much everything now! I may just try this out, when I worked in a hospital a few (wow, 10!) years ago I used to take a hit of oxygen in the morning if I felt tired (especially after a big night out...I used to be sociable!)...makes you feel a lot more alert...and seemed to help headaches a lot too.
Anyway, a lot of medical types swear by a hit of oxygen to perk them up...might just have to buy some!