I used to get them all the time - that's why I put a black out blind in my bedroom at home - but it had been been about five years since I last had one. Then not that long ago I had a severe one that meant I couldn't move at all and now this. It's still just at the warning stages just now, so I'm hoping I can get home and sleep it off before it lays me too low.

Thanks - it will be okay, I'm just being excessively cranky with people because of it.