Wandering around the flat, turning off lights, lowering blinds, turning monitors as dim as I can; turning my own to inverted colors so it’s darker.  (Ctrl-Option-Cmd 8, if you have a mac.)  It doesn’t actually help, but it’s something I can do.

Cluster headaches^[1]: go away.  We hate you.  You are not welcome here.  Leave.

^[1] “The term “headache” does not adequately convey the severity of the condition; the disease may be the most painful condition known to medical science.”