<human>: Can you summarize the given text in a few sentences?

My girlfriend and I have been living in this new apartment for the past 4 months.  For the past 3 months or so, our sleep schedules have been completely out of whack.  I used to wake up at 10am, on the dot.  Didn't matter if I went to bed at 2am or 5am, I would be up at 10.  (usually I'd be asleep at 1-2am, however).  

Lately though, both of us have been sleeping till noon, and no amount of sleep will satiate us.  I could go to bed at 10pm, and get 14 hours of sleep, and still feel the need to sleep a couple more hours.  

I am *convinced* something is wrong at this apartment.  My first thought was maybe black mold... (Another local apt was closed last year because of it)  I got the home depot tests and they came up negative.  Then I thought, maybe carbon monoxide is slowly poisoning us??  Well, we don't have any gas appliances, but what the hell...  Nope, 0ppm.  

Is there anything else that you guys can think of that might cause severe lethargy?
<bot>: I am convinced the new apartment I moved in is causing severe lethargy in myself and my gf.  What could cause this?