A couple of choice quotes

"But the narcissist also goes through much shorter and much weaker cycles.
He experiences brief periods of mania. Then he can be entertaining,
charming, and charismatic. Then he is "full of ideas and plans", attractive
and leader-like. In the manic phase, he is restless (often insomniac), full
of pent up energy, explosive, dramatic, creative, an excellent performer and
manager.

Suddenly, and often for no apparent reason, he becomes subdued, depressed,
devoid of energy, pessimistic, and "zombie-like". He oversleeps, his eating
patterns change, he is slow and pays no attention to his external appearance
or to the impression that he leaves on others. "

"The narcissist, in contrast, is the mental equivalent of an alcoholic. He
is insatiable. He directs his whole behaviour, in fact his life, to obtain
these pleasurable titbits of attention. He embeds them in a coherent,
completely biased, picture of himself. He uses them to regulates his labile
sense of self-worth and self-esteem.

To elicit constant interest, he projects to others a confabulated,
fictitious version of himself, known as the False Self. The False Self is
everything the narcissist is not: omniscient, omnipotent, charming,
intelligent, rich, or well-connected."