I'd fill this one during quiet times at work, I figure storing mental speed would make time seem to pass quicker. I'm pretty sure the RPG suggests storing heat while in hot places, so I'd certainly guess you feel colder while doing it. I have trouble getting to sleep before about 1 AM anyway, so this is an easy one for me. This is true. I kind of wonder whether storing a small amount near-constantly would be a good way to lose weight. Seems like it shouldn't be too dangerous as long as you went slowly enough. This one, I think I'd only store very slowly, if at all. The "avoid tricky situations" idea should help, but I figure that if you've got bad luck then the tricky situations are going to find you anyway. I think I'd rather just have a small store of luck and use a nicrosilmind to get more out of it. Going by the RPG, you store investiture by transferring one of your other stores into it (how do nicrosil Ferrings do it?), so I guess I'd just trade in stuff that's as useful to store as to tap, like warmth or weight. Then I'd use it to boost stuff that's difficult to store safely, like health or luck.