Solar activity affects whole marketplace, actually, and crypto-exchanges are not an exception. Solar activity does not affect prices directly, but it affects human's behavior, scientists says. Taking this into account, it is possible to stem losses.
I've heard before that sun exposition may affect positively our humor .But relating it to cryptocurrency doesn't seem right to me,what controls crypto markets are feelings and news,definitely not humor (Yes humor can have an impact but news change humor no matter if sun is present or not lol.)