It might be worth mentioning, in a subtle way, if you know what I mean so as to protect their egos.
I'm bipolar, and typically I have been high for weeks/months but not consistently very high. I have dysphoric manias according to the pshychiatrist. They start of ok, I have a lot of energy that I can't get rid of and I clean etc for England. I tend to talk at 100 mph and wave hands arms around. Then they all go a bit wrong and I get depressive symptoms but with the energy. Sort of feels like I'm wired, not pleasant. But my manias are different to my friend who gets hypomania. She functions well,( I can't function properly) and hers last days. She doesn't swing as much. I tend to crash into depression and then swing high.
Antidepressant never did me much good, then the Prozac flipped me badly I was as high as a kite and had to stop taking them suddenly.
I also spend large amounts of money that we can't afford on things I don't need, my friend doesn't. She gets happy, euphoric highs.
Bipolar is a tricky thing to diagnose, but from what you've said it is worth the conversation.
Look at the Black dog institute on the web, it's quite good.
Buttercup xxx