Very easy to self-diagnose hypomania.
For instance, when I get the idea that it would be a brilliant idea to create a meditation-themed "choose your own adventure" megathread, making extensive use of Amorphis songs, this is a good indication the old noggin' may be overheating.
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Of course, you often don't care to self-monitor during a hypomanic phase, but I've grown wise from repeated injury.