by Ottessa Moshfegh? It should be a cautionary tale about a young woman (with inherited money) who finds an unscrupulous doctor willing to prescribe her just about everything. And she finds she can sleep virtually all the time, though she also engages in dangerous, unaware activity while sleeping (including walking to the store and taking the subway).
The author tells the story with dark humor and, I have to admit, it sounds kind of appealing. Unfortunately, you can only attain this lifestyle if you have unlimited funds, no job or responsibilities, and a highly unethical psychiatrist. Nice fantasy, though!