I played basketball last Sunday after about one month absence.
Unfortunately on that day, the other side of the gym was used by a badminton circle, that means all the windows were closed.
When I entered the gym, I felt dizzy a little.
Also I had a hunch that I might feel sick in that sauna gym.
As I expected, a bad headache gave me hell.
I had to stay in bed all day yesterday... (my precious holiday spoiled...)
But now I'm so fine after a lot of sleep and a painkiller.
Thank you, Loxonin!! ＼(^o^)／