Hypomania is a mild mania, which is often followed by mania. This is a symptom of bipolar and schizoaffective disorders. There is usually a feeling of euphoria, and hyperactivity. Hypomania is a very pleasant experience, unfortunately it doesn’t last long, and if isn’t controlled quickly, can turn into mania.
There is a feeling of wakefulness, and it feels like you can do anything. It comes on quickly. One day you just feel elated and alive. You want to do a thousand things. For me, I tend to just write a lot, and sleep little. It is a rare occurrence for me, so I just try to enjoy it until it goes away. It is rare on meds, since mood stabilizers do just that, stabilize moods.
It usually only lasts for a few hours to a few days, and then either progresses to mania, or fades away. On meds, it usually just goes away after a couple of days.
If it reaches the stage of mania, that can be bad. Delusions, hallucinations are often symptoms of mania, especially for those with a mood disorder. Risky behavior can also result, as you feel you can do anything.