In my experience, yes. Excessive sleep made matters worse. It is also known that too much sleep can actually make a person drowsy during waking hours.

I try not to succumb to hypersomnia. When I am prone to it, I try to stay up until a reasonable hour (not fall asleep at 7 pm) and set the alarm for a reasonable hour (not sleep until 10 am or later). It can be hard forcing oneself up with the alarm, but if I do that, though the first hour or two might be tough, the rest are usually better. Hypersomnia creates a "hangover" feeling in me, which is not pleasant.