This book contains a character named Gretchen, who is a very feminine and beautiful woman,
and also a lesbian. She is the head of a women's health clinic. Her character isn't very fully explored, but one of the main characters of the
book is Helen, who in the end, after leaving her abusive husband, becomes a lesbian. Her character is portrayed very positively.
There is also a gay male character in 'Insomnia', named Bill. Bill is overall a positive character, although he has some nasty character traits - but then again, that's King; King doesn't write perfect people.