anxiety
"I had been taking Citalopram for over 6 years (20MG) when my doctor switched me to Escitalopram several months ago.  We started with 15MG, and it definitely helped, but my anxiety was still bad, so we decided to increase the dose to 20MG about 3 weeks ago.  I haven't had a panic attack since, but I am extremely lethargic and unmotivated.  I sleep 12-15 hours a day (I have a very flexible work schedule), and I'm still tired and take naps during the day.  I make up any excuse not to do my work, and I have trouble getting myself to do ANYTHING, including going outside.  I won't even walk to the store if I really need something.  I've always loved to sleep, but I used to be extremely self-motivated."