Stay awake.

When we do a night shift, my crew mates and I do a six hour stint at attending then swap over and do six hours of driving. Or vice verse of course.
Last night Tepic drove first and I attended, we were sent all over the place, mainly jobs but one or two cover moves, at half past midnight it was all change and my turn to drive, well for the two nights before this shift my husband was on nights, (hate it when our shifts collide and we see nothing of each other for a few days), anyway when ever he is on nights I don't sleep very well taking this into consideration together with the fact that our days were very busy I was absolutely exhausted and by three thirty the road had become not much more than a blurry haze in front of me, and I could feel sleep pulling my eyelids shut. No good! on our way to the cover point I pulled in at the first garage to get a can of Red bull, well they had an offer on which was too good to miss so I got two cans and decanted them into my empty water bottle. . . once at the cover point, then again after the next job I drank my way through 500mls of Red bull!! Yes!! it worked the road was a road again and I was wide awake and quite able to finish my shift in the knowledge that I wasn't going to crash the ambulance.
We finished on time and I drove home. Once there I began to feel fidgety and anxious it was a really uncomfortable feeling. I then remembered the same thing had happened when I had a can before, a long time ago whilst doing my EMT training. It took until about 1130-1200 before I started to feel normal again, I don't think Red bull agrees with me!