It's a good that you are considering this possibility as a sudden change in libido and energy levels can occur as part of a manic episode.
Let's check a few other typical symptoms we might expect to develop as part of elevated mood:
Have you noticed a sense of restlessness?
You have alluded to a decreased need for sleep, can you describe your current sleep pattern and how this compares to your typical longer term sleep pattern?
Have you noticed feeling like it's difficult to stop talking?
Any changes in how you spend you money?
Have you been taking on many new tasks and projects?
Have you noticed any difficulty concentrating? For example, when reading or watching TV?
Have you noticed whether your thoughts are racing? Perhaps jumping from idea to idea?
Have you noticed being more excitable or irritable?
Have you noticed feeling more anger or hostility?
Have you been feeling much more better about yourself? A noticeable improvement in your self esteem?
May of these things are hard to observe/notice in ourselves so of particular importance is whether anybody close to you has noticed a change or perhaps commented on any of these aspects?
Also of particular importance is whether you have recently changed medication (dosage, type, etc) preceeding these recent changes?