Another safe easy thing you can do if you're manic is to get some orange glasses that block blue light to help calm your brain down. By blocking blue light, the brain thinks you're in total darkness which calms you down, and will help break a manic episode. I bought a pair of these when I went off meds, and wear them whenever I can't sleep or am wound up.

Here's an article about the effect of light on the brain in bipolar. Further down the page is info about the glasses.

Bipolar Disorder, Light, and Darkness | PsychEducation