Cats wrote:

If affected do not drive or operate machinery.

Who is going to judge if you are affected? Judging ourselves is the
hardest thing to do.

The same person that judges if you are fit to fly based on all factors:
Had enough sleep? Backache? Headache? Leg(s)/Arm(s) ache?
Emotionally fit? The list is endless. If you are in doubt about being
able to judge if you are fit to fly, then don't fly.

Regards,

-Doug