Tips for dealing with mania (especially sleep)

I'm new to all of this and need some help. I'm currently in the midst of a prolonged manic episode and don't know which direction to go. My sleep has been horrible. I average 2-3 hours a night, sometimes no sleep at all, occasionally I get lucky and sleep about 6 hours. The nights that I do sleep well are usually on days when I exhaust myself with physical activity. I've walked or biked for like 8 hours straight. I have so much energy that I just want to burn off, but I fear that may be counterproductive and prolong or worsen the mania. Should I instead just rest at home? What about at night? I follow a very strict sleep routine; get up at the same time every day, get morning sunlight in my eyes, go to bed at the same time every night, no light in the eyes at night, keep room cold, wear eye mask and ear plugs. Physically I feel very comfortable but I find my mind racing a mile a minute and I end up tossing and turning. Over the last week, I've started listening to rain sounds, or soft music, or boring bedtime stories as I lay in bed in an attempt to occupy and distract my mind. But I'm concerned this just keeps my mind active. Should I instead force myself to lay still in silence?