I get this! Mine also lasts a maximum of 1 day or even half a day. I feel electrified and I want to do everything, I love everyone, I am super productive and efficient at work, confident, friendly, I talk fast. The downside is that I can be irritable and have a hard time focusing on just one task or sitting too long. But I don't think it is hypomania or mania either because I don't exude reckless behaviour and it doesn't last a full day, so I still sleep at night. Usually by that point I have come down and normally I wake up the next day feeling depressed and exhausted.